diff --git a/.reasonix/desktop-topic-title-sources.json b/.reasonix/desktop-topic-title-sources.json
index c2495bd..03a2435 100644
--- a/.reasonix/desktop-topic-title-sources.json
+++ b/.reasonix/desktop-topic-title-sources.json
@@ -34,5 +34,6 @@
   "topic_20260707-084048_75f72710c486f3de": "auto",
   "topic_20260707-091519_dc062b2bfdf4249c": "auto",
   "topic_20260707-092315_b8c3939bfc696802": "auto",
-  "topic_20260707-092711_af706c3fcc7e435e": "auto"
+  "topic_20260707-092711_af706c3fcc7e435e": "auto",
+  "topic_20260707-095503_bf879b65e4666516": "auto"
 }
\ No newline at end of file
diff --git a/.reasonix/desktop-topic-titles.json b/.reasonix/desktop-topic-titles.json
index 79160ad..e825128 100644
--- a/.reasonix/desktop-topic-titles.json
+++ b/.reasonix/desktop-topic-titles.json
@@ -34,5 +34,6 @@
   "topic_20260707-084048_75f72710c486f3de": "在这个文件的区域的头部添加一行内容…",
   "topic_20260707-091519_dc062b2bfdf4249c": "关于App.vue里的toolabr…",
   "topic_20260707-092315_b8c3939bfc696802": "当我点击目录树切换显示文件的时候，右…",
-  "topic_20260707-092711_af706c3fcc7e435e": "帮我检查一下app.vue里的too…"
+  "topic_20260707-092711_af706c3fcc7e435e": "帮我检查一下app.vue里的too…",
+  "topic_20260707-095503_bf879b65e4666516": "帮我移除markdownEditor…"
 }
\ No newline at end of file
diff --git a/src/App.vue b/src/App.vue
index 8ed863a..b97bc77 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import {ref, watch, onMounted, onUnmounted, computed} from "vue";
+import {ref, watch, onMounted, onUnmounted} from "vue";
 import {listen} from "@tauri-apps/api/event";
 import {invoke} from "@tauri-apps/api/core";
 import MarkdownEditor from "./components/MarkdownEditor.vue";
@@ -13,11 +13,6 @@ const charCount = ref(0);
 const currentFilePath = ref<string | null>(null);
 const saveStatus = ref("");
 
-// Check if current file is a Markdown file (for display-mode toggle)
-const isMarkdownFile = computed(() => {
-  return currentFilePath.value?.toLowerCase().endsWith(".md") ?? false;
-});
-
 // Folder state
 interface DirEntry {
   name: string;
@@ -78,68 +73,11 @@ function onEditorWheel(e: WheelEvent) {
   }, 1500);
 }
 
-// ---- full-width mode ----
-function loadFullWidthPref(): boolean {
-  try {
-    return localStorage.getItem("editor-full-width") === "true";
-  } catch {
-    return false;
-  }
-}
-
-const isFullWidth = ref(loadFullWidthPref());
-
-function onToggleFullWidth(val: boolean) {
-  isFullWidth.value = val;
-  try {
-    localStorage.setItem("editor-full-width", String(val));
-  } catch { /* noop */
-  }
-}
-
-// ---- display mode (split / wysiwyg) ----
-type DisplayMode = "split" | "wysiwyg";
-
-function loadDisplayModePref(): DisplayMode {
-  try {
-    const v = localStorage.getItem("editor-display-mode");
-    if (v === "split" || v === "wysiwyg") return v;
-  } catch { /* noop */
-  }
-  return "split";
-}
-
-const displayMode = ref<DisplayMode>(loadDisplayModePref());
-
-function onToggleDisplayMode(val: DisplayMode) {
-  displayMode.value = val;
-  try {
-    localStorage.setItem("editor-display-mode", val);
-  } catch { /* noop */
-  }
-}
-
 // ---- toolbar state ----
 const showThumbnail = ref(true);
 const previewOnly = ref(false);
 const showMoreMenu = ref(false);
 
-function toggleFullWidth() {
-  isFullWidth.value = !isFullWidth.value;
-  try {
-    localStorage.setItem("editor-full-width", String(isFullWidth.value));
-  } catch { /* noop */
-  }
-}
-
-function toggleDisplayMode() {
-  displayMode.value = displayMode.value === "split" ? "wysiwyg" : "split";
-  try {
-    localStorage.setItem("editor-display-mode", displayMode.value);
-  } catch { /* noop */
-  }
-}
-
 function handleExportPdf() {
   showMoreMenu.value = false;
   // TODO: implement PDF export
@@ -347,22 +285,17 @@ listen("menu-event", (event) => {
           :entries="dirEntries"
           :content="content"
           :current-file-path="currentFilePath"
-          :is-full-width="isFullWidth"
-          :display-mode="displayMode"
-          :is-markdown-file="isMarkdownFile"
           @heading-click="onHeadingClick"
           @open-folder="onOpenFolder"
           @toggle-folder="onToggleFolder"
           @open-file="onOpenFile"
-          @toggle-full-width="onToggleFullWidth"
-          @toggle-display-mode="onToggleDisplayMode"
       />
 
       <!-- Right: Editor area -->
       <main class="flex-1 flex flex-col overflow-hidden relative">
         <!-- ════════════════ Toolbar ════════════════ -->
         <div
-            class="flex w-full items-center h-10 px-3 bg-[#faf9f6] border border-[#e0dbcf] border-b-0 select-none shrink-0"
+            class="flex w-full items-center h-10 px-3 bg-[#faf9f6] border-b border-[#e0dbcf] select-none shrink-0"
         >
           <!-- Left: Thumbnail toggle -->
           <button
@@ -386,26 +319,6 @@ listen("menu-event", (event) => {
 
           <!-- Right: Actions -->
           <div class="flex items-center gap-0.5">
-            <!-- Display mode toggle (only for .md files) -->
-            <button
-                v-if="isMarkdownFile"
-                class="toolbar-btn"
-                :title="displayMode === 'wysiwyg' ? '切换到双栏' : '切换到单栏'"
-                @click="toggleDisplayMode"
-            >
-              <!-- Split icon (shown when single, meaning click to switch to split) -->
-              <svg v-if="displayMode === 'wysiwyg'" width="16" height="16" viewBox="0 0 16 16" fill="none"
-                   stroke="currentColor" stroke-width="1.5">
-                <rect x="1" y="2" width="6" height="12" rx="1"/>
-                <rect x="9" y="2" width="6" height="12" rx="1"/>
-              </svg>
-              <!-- Single icon -->
-              <svg v-else width="16" height="16" viewBox="0 0 16 16" fill="none" stroke="currentColor"
-                   stroke-width="1.5">
-                <rect x="3" y="2" width="10" height="12" rx="1"/>
-              </svg>
-            </button>
-
             <!-- Preview/Edit toggle -->
             <button
                 class="toolbar-btn"
@@ -418,18 +331,6 @@ listen("menu-event", (event) => {
               </svg>
             </button>
 
-            <!-- Full-width toggle -->
-            <button
-                class="toolbar-btn"
-                :class="{ 'toolbar-btn-active': isFullWidth }"
-                title="切换全宽"
-                @click="toggleFullWidth"
-            >
-              <svg width="16" height="16" viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5">
-                <path d="M10 1h5v5M6 15H1v-5M15 1l-5 5M1 15l5-5"/>
-              </svg>
-            </button>
-
             <!-- More menu -->
             <div class="relative">
               <button
@@ -462,8 +363,6 @@ listen("menu-event", (event) => {
         </div>
         <MarkdownEditor
             :model-value="content"
-            :is-full-width="isFullWidth"
-            :display-mode="displayMode"
             :preview-only="previewOnly"
             placeholder="输入 Markdown 内容... 支持标题、粗体、斜体、代码块等 ✨"
             @update:model-value="onUpdate"
diff --git a/src/components/DirectorySidebar.vue b/src/components/DirectorySidebar.vue
index 05c4cdc..e013fa4 100644
--- a/src/components/DirectorySidebar.vue
+++ b/src/components/DirectorySidebar.vue
@@ -15,16 +15,10 @@ const props = withDefaults(
       entries: DirEntry[];
       content?: string;
       currentFilePath?: string | null;
-      isFullWidth?: boolean;
-      displayMode?: "split" | "wysiwyg";
-      isMarkdownFile?: boolean;
     }>(),
     {
       content: "",
       currentFilePath: null,
-      isFullWidth: false,
-      displayMode: "split",
-      isMarkdownFile: false,
     },
 );
 
@@ -35,8 +29,6 @@ const emit = defineEmits<{
   openFile: [path: string];
   createFile: [];
   createFolder: [];
-  toggleFullWidth: [value: boolean];
-  toggleDisplayMode: [value: "split" | "wysiwyg"];
 }>();
 
 // Wrap the workspace root as a top-level tree node
@@ -254,57 +246,6 @@ const showSettings = ref(false);
           </button>
         </div>
         <div class="px-4 py-6 space-y-5">
-          <!-- Display mode toggle (only for .md files) -->
-          <div v-if="props.isMarkdownFile" class="flex items-center justify-between">
-            <div class="flex-1 mr-3">
-              <p class="text-sm text-[#38342e] font-medium">编辑模式</p>
-              <p class="text-xs text-[#8c877d] mt-0.5 leading-relaxed">
-                {{ props.displayMode === "wysiwyg" ? "单栏：所见即所得，预览区直接编辑" : "双栏：左侧编辑源码，右侧预览效果" }}
-              </p>
-            </div>
-            <button
-              type="button"
-              role="switch"
-              :aria-checked="props.displayMode === 'wysiwyg'"
-              :class="[
-                'relative inline-flex h-5 w-9 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors duration-200 ease-in-out focus:outline-none',
-                props.displayMode === 'wysiwyg' ? 'bg-[#bf6a3b]' : 'bg-[#d4cfc4]',
-              ]"
-              @click="emit('toggleDisplayMode', props.displayMode === 'wysiwyg' ? 'split' : 'wysiwyg')"
-            >
-              <span
-                :class="[
-                  'pointer-events-none inline-block h-4 w-4 rounded-full bg-white shadow-sm ring-0 transition-transform duration-200 ease-in-out',
-                  props.displayMode === 'wysiwyg' ? 'translate-x-4' : 'translate-x-0',
-                ]"
-              />
-            </button>
-          </div>
-
-          <!-- Full-width mode toggle -->
-          <div class="flex items-center justify-between">
-            <div class="flex-1 mr-3">
-              <p class="text-sm text-[#38342e] font-medium">全宽模式</p>
-              <p class="text-xs text-[#8c877d] mt-0.5 leading-relaxed">关闭后编辑器居中显示，适合专注书写</p>
-            </div>
-            <button
-              type="button"
-              role="switch"
-              :aria-checked="props.isFullWidth"
-              :class="[
-                'relative inline-flex h-5 w-9 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors duration-200 ease-in-out focus:outline-none',
-                props.isFullWidth ? 'bg-[#bf6a3b]' : 'bg-[#d4cfc4]',
-              ]"
-              @click="emit('toggleFullWidth', !props.isFullWidth)"
-            >
-              <span
-                :class="[
-                  'pointer-events-none inline-block h-4 w-4 rounded-full bg-white shadow-sm ring-0 transition-transform duration-200 ease-in-out',
-                  props.isFullWidth ? 'translate-x-4' : 'translate-x-0',
-                ]"
-              />
-            </button>
-          </div>
         </div>
       </div>
     </div>
diff --git a/src/components/MarkdownEditor.vue b/src/components/MarkdownEditor.vue
index 64f9886..b3933f7 100644
--- a/src/components/MarkdownEditor.vue
+++ b/src/components/MarkdownEditor.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref, watch, nextTick, computed } from "vue";
+import { ref, watch, nextTick } from "vue";
 import { unified } from "unified";
 import remarkParse from "remark-parse";
 import remarkGfm from "remark-gfm";
@@ -11,15 +11,11 @@ const props = withDefaults(
   defineProps<{
     modelValue?: string;
     placeholder?: string;
-    isFullWidth?: boolean;
-    displayMode?: "split" | "wysiwyg";
     previewOnly?: boolean;
   }>(),
   {
     modelValue: "",
     placeholder: "开始写作...",
-    isFullWidth: false,
-    displayMode: "split",
     previewOnly: false,
   },
 );
@@ -29,8 +25,6 @@ const emit = defineEmits<{
   "save-shortcut": [];
 }>();
 
-const isSingle = computed(() => props.displayMode === "wysiwyg");
-
 // ── Unified processors ─────────────────────────────────────────────
 
 /** Full pipeline: markdown → HTML */
@@ -41,10 +35,7 @@ const md2html = unified()
   .use(rehypeSanitize)
   .use(rehypeStringify);
 
-/** Parser only: markdown → mdast (for block extraction) */
-const mdParser = unified().use(remarkParse).use(remarkGfm);
-
-// ── Split-pane rendering ───────────────────────────────────────────
+// ── Rendering ──────────────────────────────────────────────────────
 
 const renderedHtml = ref("");
 const renderError = ref(false);
@@ -63,169 +54,21 @@ function renderFullHtml(md: string) {
 watch(
   () => props.modelValue,
   (val) => {
-    if (!isSingle.value) renderFullHtml(val);
+    renderFullHtml(val);
     // 切换文件时重置滚动位置到顶部
     nextTick(() => {
-      if (previewRef.value) previewRef.value.scrollTop = 0;
-      if (splitTextareaRef.value) splitTextareaRef.value.scrollTop = 0;
+      if (scrollRef.value) scrollRef.value.scrollTop = 0;
     });
   },
   { immediate: true },
 );
 
-watch(isSingle, (single) => {
-  if (!single) renderFullHtml(props.modelValue);
-});
+// ── Editor textarea handlers ───────────────────────────────────────
 
-// ── Block-level editing (single-pane mode) ─────────────────────────
+const editorTextareaRef = ref<HTMLTextAreaElement>();
+const scrollRef = ref<HTMLDivElement>();
 
-interface Block {
-  id: string;
-  source: string;
-  html: string;
-  startOffset: number;
-  endOffset: number;
-}
-
-const blocks = ref<Block[]>([]);
-const editingBlockId = ref<string | null>(null);
-const editingSource = ref("");
-
-/** Parse markdown into editable blocks */
-function parseBlocks(md: string) {
-  if (!md.trim()) {
-    blocks.value = [];
-    return;
-  }
-  try {
-    const tree = mdParser.parse(md);
-    blocks.value = (tree.children as any[])
-      .filter((c: any) => c.position?.start?.offset != null)
-      .map((c: any, i: number) => {
-        const source = md.slice(
-          c.position.start.offset!,
-          c.position.end.offset!,
-        );
-        let html = "";
-        try {
-          const file = md2html.processSync(source);
-          html = String(file.value);
-        } catch {
-          html = `<p>${escapeHtml(source)}</p>`;
-        }
-        return {
-          id: `b${i}`,
-          source,
-          html,
-          startOffset: c.position.start.offset!,
-          endOffset: c.position.end.offset!,
-        };
-      });
-  } catch {
-    blocks.value = [];
-  }
-}
-
-function escapeHtml(s: string): string {
-  return s
-    .replace(/&/g, "&amp;")
-    .replace(/</g, "&lt;")
-    .replace(/>/g, "&gt;");
-}
-
-const singlePaneRef = ref<HTMLDivElement>();
-
-// Watch modelValue → re-parse blocks in single mode
-watch(
-  () => props.modelValue,
-  (val) => {
-    if (isSingle.value) parseBlocks(val);
-    // 切换文件时重置滚动位置到顶部
-    nextTick(() => {
-      if (singlePaneRef.value) singlePaneRef.value.scrollTop = 0;
-    });
-  },
-  { immediate: true },
-);
-
-watch(isSingle, (single) => {
-  if (single) parseBlocks(props.modelValue);
-});
-
-// ── Block editing actions ──────────────────────────────────────────
-
-function startEdit(blockId: string) {
-  const block = blocks.value.find((b) => b.id === blockId);
-  if (!block) return;
-  editingBlockId.value = blockId;
-  editingSource.value = block.source;
-
-  void nextTick(() => {
-    const ta = document.querySelector(
-      ".block-editor-textarea",
-    ) as HTMLTextAreaElement | null;
-    if (ta) {
-      autoResize(ta);
-      ta.focus();
-      // Place cursor at end
-      ta.setSelectionRange(ta.value.length, ta.value.length);
-    }
-  });
-}
-
-function finalizeEdit() {
-  const blockId = editingBlockId.value;
-  if (!blockId) return;
-  const block = blocks.value.find((b) => b.id === blockId);
-  editingBlockId.value = null;
-
-  if (!block) return;
-  const newSource = editingSource.value;
-
-  if (newSource === block.source) return; // no change
-
-  // Replace the block's portion in the full markdown
-  const before = props.modelValue.slice(0, block.startOffset);
-  const after = props.modelValue.slice(block.endOffset);
-  emit("update:modelValue", before + newSource + after);
-}
-
-function cancelEdit() {
-  editingBlockId.value = null;
-}
-
-function onBlockKeydown(e: KeyboardEvent) {
-  // Ctrl+S save
-  if ((e.ctrlKey || e.metaKey) && e.key === "s") {
-    e.preventDefault();
-    // Finalize current edit first, then save
-    if (editingBlockId.value) finalizeEdit();
-    emit("save-shortcut");
-    return;
-  }
-  // Escape to cancel
-  if (e.key === "Escape") {
-    e.preventDefault();
-    cancelEdit();
-    return;
-  }
-  // Auto-resize on any key
-  void nextTick(() => {
-    const ta = e.target as HTMLTextAreaElement;
-    autoResize(ta);
-  });
-}
-
-function autoResize(ta: HTMLTextAreaElement) {
-  ta.style.height = "auto";
-  ta.style.height = ta.scrollHeight + 2 + "px";
-}
-
-// ── Split-pane textarea handlers ───────────────────────────────────
-
-const splitTextareaRef = ref<HTMLTextAreaElement>();
-
-function onSplitInput(e: Event) {
+function onEditorInput(e: Event) {
   const val = (e.target as HTMLTextAreaElement).value;
   emit("update:modelValue", val);
   renderFullHtml(val);
@@ -267,7 +110,7 @@ function tryAutoPair(
   return true;
 }
 
-function onSplitKeydown(e: KeyboardEvent) {
+function onEditorKeydown(e: KeyboardEvent) {
   if ((e.ctrlKey || e.metaKey) && e.key === "s") {
     e.preventDefault();
     emit("save-shortcut");
@@ -298,122 +141,44 @@ function onSplitKeydown(e: KeyboardEvent) {
     return;
   }
 }
-
-// ── Scroll sync (split mode) ───────────────────────────────────────
-
-const previewRef = ref<HTMLDivElement>();
-
-function onSplitScroll() {
-  if (!splitTextareaRef.value || !previewRef.value) return;
-  const ratio =
-    splitTextareaRef.value.scrollTop /
-    (splitTextareaRef.value.scrollHeight -
-      splitTextareaRef.value.clientHeight || 1);
-  previewRef.value.scrollTop =
-    ratio *
-    (previewRef.value.scrollHeight - previewRef.value.clientHeight);
-}
 </script>
 
 <template>
   <div
-    :class="[
-      'flex flex-1 w-full border border-[#e0dbcf] bg-white shadow-2xl overflow-hidden',
-      !props.isFullWidth && 'mx-auto',
-    ]"
-    :style="
-      !props.isFullWidth
-        ? { maxWidth: `calc(1600px * var(--editor-zoom, 1))` }
-        : undefined
-    "
+    ref="scrollRef"
+    class="flex-1 w-full overflow-auto"
     @wheel.passive
   >
-    <!-- ════════════════ Single-pane: block editing ════════════════ -->
     <div
-      v-if="isSingle"
-      ref="singlePaneRef"
-      class="flex-1 overflow-auto p-8 pb-40"
-      :style="{ fontSize: `calc(1rem * var(--editor-zoom, 1))` }"
+      class="mx-auto px-8 pb-40 pt-8 h-full"
+      :style="{
+        maxWidth: `calc(700px * var(--editor-zoom, 1))`,
+        fontSize: `calc(1rem * var(--editor-zoom, 1))`,
+      }"
     >
-      <!-- Empty state -->
-      <div
-        v-if="blocks.length === 0"
-        class="text-[#b8b3a8] font-serif leading-relaxed select-none"
-        @click="emit('update:modelValue', '\n'); parseBlocks('\n')"
-      >
-        {{ props.placeholder }}
-      </div>
+      <!-- Editor mode -->
+      <textarea
+        v-if="!previewOnly"
+        ref="editorTextareaRef"
+        :value="props.modelValue"
+        :placeholder="props.placeholder"
+        class="
+          w-full h-full min-h-[60vh] resize-none bg-transparent outline-none
+          font-serif text-[#38342e] leading-relaxed
+          placeholder:text-[#b8b3a8]
+        "
+        @input="onEditorInput"
+        @keydown="onEditorKeydown"
+      />
 
-      <!-- Blocks -->
-      <template v-for="block in blocks" :key="block.id">
-        <!-- Editing state -->
-        <textarea
-          v-if="editingBlockId === block.id"
-          v-model="editingSource"
-          class="
-            block-editor-textarea
-            w-full resize-none outline-none
-            font-mono text-sm text-[#38342e] leading-relaxed
-            bg-[#faf9f6] border border-[#bf6a3b] rounded-md
-            px-3 py-2 mb-1
-          "
-          rows="1"
-          @keydown="onBlockKeydown"
-          @blur="finalizeEdit"
-        />
-
-        <!-- Rendered state (clickable) -->
-        <div
-          v-else
-          :class="[
-            'markdown-preview block-render py-px',
-            previewOnly ? '' : 'cursor-text rounded -mx-1 px-1 hover:bg-[#faf9f6] transition-colors',
-          ]"
-          v-html="block.html"
-          @click="!previewOnly && startEdit(block.id)"
-        />
-      </template>
-    </div>
-
-    <!-- ════════════════ Split-pane mode ════════════════ -->
-    <template v-else>
-      <!-- Textarea column: smoothly collapses width on preview-only -->
-      <div
-        :class="[
-          'flex flex-col min-h-0 transition-[width,opacity] duration-300 ease-in-out',
-          previewOnly
-            ? 'w-0 overflow-hidden opacity-0 border-r-0'
-            : 'flex-1 min-w-0 border-r border-[#e0dbcf] opacity-100',
-        ]"
-      >
-        <textarea
-          ref="splitTextareaRef"
-          :value="props.modelValue"
-          :placeholder="props.placeholder"
-          class="
-            flex-1 min-h-0 w-full resize-none bg-white p-8 pb-40 outline-none
-            font-serif text-[#38342e] leading-relaxed
-            placeholder:text-[#b8b3a8]
-          "
-          :style="{ fontSize: `calc(1rem * var(--editor-zoom, 1))` }"
-          @input="onSplitInput"
-          @keydown="onSplitKeydown"
-          @scroll="onSplitScroll"
-        />
-      </div>
-
-      <!-- Preview column: smoothly expands to fill available space -->
-      <div
-        ref="previewRef"
-        class="flex-1 min-w-0 min-h-0 overflow-auto p-8 pb-40 transition-[width] duration-300 ease-in-out"
-        :style="{ fontSize: `calc(1rem * var(--editor-zoom, 1))` }"
-      >
+      <!-- Preview mode -->
+      <div v-else class="min-h-[60vh]">
         <div v-if="renderError" class="text-red-500 text-sm">
           ⚠ Markdown 解析错误
         </div>
         <div v-else class="markdown-preview" v-html="renderedHtml" />
       </div>
-    </template>
+    </div>
   </div>
 </template>
 
@@ -528,15 +293,4 @@ function onSplitScroll() {
   border-radius: 0.25rem;
   margin: 0.5em 0;
 }
-
-/* ── Block editing textarea ────────────────────────────────────── */
-
-.block-editor-textarea {
-  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
-  min-height: 2em;
-  scrollbar-width: none;
-}
-.block-editor-textarea::-webkit-scrollbar {
-  display: none;
-}
 </style>