diff --git a/packages/editor/src/layouts/NavMenuColumn.vue b/packages/editor/src/layouts/NavMenuColumn.vue
index 390d0aca..07a131f3 100644
--- a/packages/editor/src/layouts/NavMenuColumn.vue
+++ b/packages/editor/src/layouts/NavMenuColumn.vue
@@ -62,13 +62,14 @@ const props = withDefaults(
     width?: number;
     /** 子元素之间的间距，需与 SCSS gap 保持一致 */
     gap?: number;
-    /** Popover 内容宽度 */
-    popoverWidth?: number;
+    /**
+     * Popover 内容宽度。不传时按内容撑开，避免下拉框超出菜单。
+     */
+    popoverWidth?: number | string;
   }>(),
   {
     items: () => [],
     gap: 3,
-    popoverWidth: 180,
   },
 );
 
@@ -110,7 +111,18 @@ const containerWidth = ref(0);
 const hiddenIndexSet = ref<Set<number>>(new Set());
 
 const hasOverflow = computed(() => hiddenIndexSet.value.size > 0);
-const overflowItems = computed(() => props.items.filter((_, index) => hiddenIndexSet.value.has(index)));
+// 更多菜单是纵向列表：分割线改成横线；收进去的首尾分割线没有分组意义，直接去掉。
+const overflowItems = computed(() => {
+  const items = props.items
+    .filter((_, index) => hiddenIndexSet.value.has(index))
+    .map((item) => (item.type === 'divider' ? { ...item, direction: 'horizontal' as const } : item));
+
+  let start = 0;
+  let end = items.length;
+  while (start < end && items[start].type === 'divider') start += 1;
+  while (end > start && items[end - 1].type === 'divider') end -= 1;
+  return items.slice(start, end);
+});
 
 const measureAndCompute = () => {
   if (!columnEl.value) return;
diff --git a/packages/editor/src/theme/nav-menu.scss b/packages/editor/src/theme/nav-menu.scss
index e1fa862e..6545ab29 100644
--- a/packages/editor/src/theme/nav-menu.scss
+++ b/packages/editor/src/theme/nav-menu.scss
@@ -120,7 +120,12 @@
   }
 }
 
-.m-editor-nav-menu-popover {
+.tmagic-design-popper.m-editor-nav-menu-popover {
+  // 不固定宽度，按内容撑开，避免下拉框超出菜单；content-box 让 padding 不挤占内容宽度。
+  width: max-content;
+  min-width: 180px;
+  box-sizing: content-box;
+
   .m-editor-nav-menu-overflow-list {
     display: flex;
     flex-direction: column;
@@ -139,8 +144,30 @@
       }
 
       &.divider {
-        padding: 0;
+        display: flex;
+        align-items: center;
+        align-self: stretch;
+        width: auto;
+        height: auto;
+        padding: 4px 12px;
         cursor: default;
+        box-sizing: border-box;
+
+        // 更多菜单是纵向列表，分割线必须盖过组件默认的竖线样式
+        .tmagic-design-divider,
+        .el-divider,
+        .t-divider {
+          display: block;
+          flex: 1 1 auto;
+          width: 100%;
+          min-width: 0;
+          height: 0;
+          margin: 0;
+          border: 0;
+          border-top: 1px solid var(--el-border-color, #dcdfe6);
+          border-left: 0;
+          position: static;
+        }
 
         &:hover {
           background-color: transparent;
diff --git a/packages/editor/tests/unit/layouts/NavMenuColumn.spec.ts b/packages/editor/tests/unit/layouts/NavMenuColumn.spec.ts
index 497ef6ce..68681124 100644
--- a/packages/editor/tests/unit/layouts/NavMenuColumn.spec.ts
+++ b/packages/editor/tests/unit/layouts/NavMenuColumn.spec.ts
@@ -21,7 +21,8 @@ vi.mock('@editor/components/ToolButton.vue', () => ({
           'button',
           {
             ref: rootEl,
-            class: ['tool-btn', (props.data as any)?.className],
+            class: ['tool-btn', (props.data as any)?.className, (props.data as any)?.type],
+            'data-direction': (props.data as any)?.direction || '',
           },
           (props.data as any)?.text || '',
         );
@@ -119,6 +120,15 @@ describe('NavMenuColumn', () => {
     expect(moreWrapper.classes()).toContain('m-editor-nav-menu-more-wrapper-hidden');
   });
 
+  test('未指定 popoverWidth 时不给更多菜单固定宽度', () => {
+    const wrapper = mount(NavMenuColumn as any, {
+      props: { columnKey: 'left', items: [{ type: 'button', text: 'A' }] },
+    });
+    const popover = wrapper.findComponent({ name: 'TMagicPopover' });
+    expect(popover.exists()).toBe(true);
+    expect(popover.props('width')).toBeUndefined();
+  });
+
   test('点击 more 引用元素切换 popover 显示状态', async () => {
     const wrapper = mount(NavMenuColumn as any, {
       props: { columnKey: 'left', items: [{ type: 'button', text: 'A' }] },
@@ -344,6 +354,127 @@ describe('NavMenuColumn', () => {
     wrapper.unmount();
   });
 
+  test('更多菜单中的分割线改为横向，工具栏中的分割线保持竖向', async () => {
+    const items = [
+      { type: 'button', text: 'A' },
+      { type: 'button', text: 'B' },
+      { type: 'divider', className: 'sep' },
+      { type: 'button', text: 'C' },
+    ];
+
+    const wrapper = mount(NavMenuColumn as any, {
+      props: { columnKey: 'right', items, width: 80 },
+      attachTo: document.body,
+    });
+
+    const columnEl = wrapper.find('.m-editor-nav-menu-column').element as HTMLElement;
+    Object.defineProperty(columnEl, 'clientWidth', { configurable: true, get: () => 80 });
+
+    const moreEl = wrapper.find('.m-editor-nav-menu-more-wrapper').element as HTMLElement;
+    moreEl.getBoundingClientRect = () => ({
+      width: 30,
+      height: 0,
+      top: 0,
+      left: 0,
+      right: 0,
+      bottom: 0,
+      x: 0,
+      y: 0,
+      toJSON: () => ({}),
+    });
+
+    wrapper.findAll('.tool-btn').forEach((b) => {
+      const el = b.element as HTMLElement;
+      el.getBoundingClientRect = () => ({
+        width: 40,
+        height: 0,
+        top: 0,
+        left: 0,
+        right: 0,
+        bottom: 0,
+        x: 0,
+        y: 0,
+        toJSON: () => ({}),
+      });
+    });
+
+    roCallbacks.forEach((cb) => cb());
+    await flushRaf();
+    await flushRaf();
+
+    const overflowDividers = wrapper.findAll('.m-editor-nav-menu-overflow-list .sep');
+    expect(overflowDividers.length).toBeGreaterThan(0);
+    overflowDividers.forEach((divider) => {
+      expect(divider.attributes('data-direction')).toBe('horizontal');
+    });
+
+    wrapper.findAll('.m-editor-nav-menu-column > .sep').forEach((divider) => {
+      expect(divider.attributes('data-direction')).toBe('');
+    });
+
+    wrapper.unmount();
+  });
+
+  test('更多菜单首尾的分割线会被去掉，中间的分割线保留', async () => {
+    const items = [
+      { type: 'button', text: 'A' },
+      { type: 'divider', className: 'lead' },
+      { type: 'button', text: 'B' },
+      { type: 'divider', className: 'mid' },
+      { type: 'button', text: 'C' },
+      { type: 'divider', className: 'trail' },
+    ];
+
+    const wrapper = mount(NavMenuColumn as any, {
+      props: { columnKey: 'right', items, width: 80 },
+      attachTo: document.body,
+    });
+
+    const columnEl = wrapper.find('.m-editor-nav-menu-column').element as HTMLElement;
+    Object.defineProperty(columnEl, 'clientWidth', { configurable: true, get: () => 80 });
+
+    const moreEl = wrapper.find('.m-editor-nav-menu-more-wrapper').element as HTMLElement;
+    moreEl.getBoundingClientRect = () => ({
+      width: 30,
+      height: 0,
+      top: 0,
+      left: 0,
+      right: 0,
+      bottom: 0,
+      x: 0,
+      y: 0,
+      toJSON: () => ({}),
+    });
+
+    wrapper.findAll('.tool-btn').forEach((b) => {
+      const el = b.element as HTMLElement;
+      el.getBoundingClientRect = () => ({
+        width: 40,
+        height: 0,
+        top: 0,
+        left: 0,
+        right: 0,
+        bottom: 0,
+        x: 0,
+        y: 0,
+        toJSON: () => ({}),
+      });
+    });
+
+    roCallbacks.forEach((cb) => cb());
+    await flushRaf();
+    await flushRaf();
+
+    const overflow = wrapper.find('.m-editor-nav-menu-overflow-list');
+    expect(overflow.find('.lead').exists()).toBe(false);
+    expect(overflow.find('.trail').exists()).toBe(false);
+    expect(
+      overflow.findAll('.tool-btn').map((button) => button.text() || button.classes().find((name) => name === 'mid')),
+    ).toEqual(['B', 'mid', 'C']);
+
+    wrapper.unmount();
+  });
+
   test('卸载时清理 ResizeObserver', () => {
     const wrapper = mount(NavMenuColumn as any, {
       props: { columnKey: 'left', items: [{ type: 'button', text: 'A' }] },