diff --git a/apps/viewer/src/App.vue b/apps/viewer/src/App.vue
index 7236cf7..f606b31 100644
--- a/apps/viewer/src/App.vue
+++ b/apps/viewer/src/App.vue
@@ -1,9 +1,8 @@
 <script setup lang="ts">
-import { computed, onBeforeUnmount, onMounted, ref, watchEffect } from 'vue';
+import { computed, watchEffect } from 'vue';
 import { useRoute } from 'vue-router';
 import { useI18n } from 'vue-i18n';
 import LocaleSwitcher from './components/LocaleSwitcher.vue';
-import { reducedMotion, toggleReducedMotion } from './ui/prefs';
 // UI-02 V01 视觉 token：变量全部作用域在 .viewer-shell 类上（非 :root 全局），
 // embed 分支不挂该类 → 嵌入 iframe 不消费任何 token（隔离红线）。
 import './styles/viewer-tokens.css';
@@ -20,34 +19,6 @@ watchEffect(() => {
   document.title = t('app.title');
   document.documentElement.setAttribute('lang', locale.value);
 });
-
-// —— 顶栏轻量菜单（UI-02 §3.2）：减少动画入口收进语言旁「⋯」，可发现但不占整行 ——
-const prefsOpen = ref(false);
-const prefsRootEl = ref<HTMLElement | null>(null);
-
-function closePrefs(): void {
-  prefsOpen.value = false;
-}
-
-function onPrefsKeydown(event: KeyboardEvent): void {
-  if (event.key === 'Escape') closePrefs();
-}
-
-function onOuterPointerDown(event: PointerEvent): void {
-  if (prefsOpen.value && prefsRootEl.value !== null && !prefsRootEl.value.contains(event.target as Node)) {
-    closePrefs();
-  }
-}
-
-onMounted(() => {
-  document.addEventListener('pointerdown', onOuterPointerDown, true);
-  document.addEventListener('keydown', onPrefsKeydown);
-});
-
-onBeforeUnmount(() => {
-  document.removeEventListener('pointerdown', onOuterPointerDown, true);
-  document.removeEventListener('keydown', onPrefsKeydown);
-});
 </script>
 
 <template>
@@ -63,34 +34,6 @@ onBeforeUnmount(() => {
       </span>
       <div class="topbar-actions">
         <LocaleSwitcher />
-        <div ref="prefsRootEl" class="prefs-menu">
-          <button
-            type="button"
-            class="icon-btn"
-            :aria-label="t('viewer.settings')"
-            aria-haspopup="menu"
-            :aria-expanded="prefsOpen"
-            @click="prefsOpen = !prefsOpen"
-          >
-            <svg viewBox="0 0 24 24" aria-hidden="true" focusable="false">
-              <circle cx="5" cy="12" r="2" fill="currentColor" />
-              <circle cx="12" cy="12" r="2" fill="currentColor" />
-              <circle cx="19" cy="12" r="2" fill="currentColor" />
-            </svg>
-          </button>
-          <div v-if="prefsOpen" class="prefs-popover" role="menu" :aria-label="t('viewer.settings')">
-            <button
-              type="button"
-              class="prefs-item"
-              role="menuitemcheckbox"
-              :aria-checked="reducedMotion"
-              @click="toggleReducedMotion"
-            >
-              <span class="prefs-check" aria-hidden="true">{{ reducedMotion ? '✓' : '' }}</span>
-              {{ t('viewer.reduceMotion') }}
-            </button>
-          </div>
-        </div>
       </div>
     </header>
     <main class="viewer-main">
@@ -166,72 +109,6 @@ body {
   align-items: center;
   gap: 4px;
 }
-.prefs-menu {
-  position: relative;
-}
-.icon-btn {
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  width: var(--viewer-touch-target);
-  height: var(--viewer-touch-target);
-  border: none;
-  border-radius: 50%;
-  background: transparent;
-  color: var(--viewer-text-secondary);
-  cursor: pointer;
-}
-.icon-btn:hover {
-  background: var(--viewer-page-bg);
-}
-.icon-btn:focus-visible {
-  outline: 2px solid var(--viewer-primary);
-  outline-offset: -2px;
-}
-.icon-btn svg {
-  width: 22px;
-  height: 22px;
-}
-.prefs-popover {
-  position: absolute;
-  top: calc(100% + 2px);
-  right: 0;
-  z-index: 130;
-  min-width: 176px;
-  border: 1px solid var(--viewer-divider);
-  border-radius: 12px;
-  background: var(--viewer-surface);
-  box-shadow: 0 8px 24px rgba(23, 32, 51, 0.12);
-  padding: 4px;
-  display: grid;
-}
-.prefs-item {
-  display: flex;
-  align-items: center;
-  gap: 8px;
-  min-height: var(--viewer-touch-target);
-  border: none;
-  border-radius: 8px;
-  background: transparent;
-  color: var(--viewer-text);
-  padding: 0 12px;
-  font-size: 0.875rem;
-  text-align: left;
-  cursor: pointer;
-}
-.prefs-item:hover {
-  background: var(--viewer-page-bg);
-}
-.prefs-item:focus-visible {
-  outline: 2px solid var(--viewer-primary);
-  outline-offset: -2px;
-}
-.prefs-check {
-  display: inline-block;
-  width: 1em;
-  color: var(--viewer-primary);
-  font-weight: 700;
-}
 /* V01 §3.2：内容页不再有全局 16px 包围——宣传图/照片边到边，内边距由
  * 信息区（AlbumHeader）与照片区（PhotoFeed，Task 3）各自负责。 */
 .viewer-main {
diff --git a/apps/viewer/src/__tests__/viewer-shell.spec.ts b/apps/viewer/src/__tests__/viewer-shell.spec.ts
index 6ea2430..ca8b463 100644
--- a/apps/viewer/src/__tests__/viewer-shell.spec.ts
+++ b/apps/viewer/src/__tests__/viewer-shell.spec.ts
@@ -73,7 +73,7 @@ describe('viewer shell tokens and embed isolation (UI-02 V01)', () => {
     expect(css).toContain('.viewer-shell');
   });
 
-  it('normal routes render .viewer-shell with PhotoLive brand top bar and prefs menu', async () => {
+  it('normal routes render .viewer-shell with PhotoLive brand top bar (locale only, no prefs menu)', async () => {
     await router.push('/');
     await router.isReady();
     const app = mountApp();
@@ -86,17 +86,9 @@ describe('viewer shell tokens and embed isolation (UI-02 V01)', () => {
     expect(topbar.find('.brand-name').text()).toBe('PhotoLive');
     expect(topbar.find('.locale-trigger').exists()).toBe(true);
 
-    // 「⋯」轻量菜单（§3.2）：减少动画入口可发现、可切换。
-    const more = topbar.find('.icon-btn');
-    expect(more.attributes('aria-haspopup')).toBe('menu');
-    await more.trigger('click');
-    const item = app.find('.prefs-item');
-    expect(item.text()).toBe('减少动画');
-    const before = item.attributes('aria-checked');
-    await item.trigger('click');
-    expect(app.find('.prefs-item').attributes('aria-checked')).toBe(before === 'true' ? 'false' : 'true');
-    // 还原模块级偏好单例，避免影响后续用例。
-    await app.find('.prefs-item').trigger('click');
+    // 设置菜单已按用户要求移除（2026-09-23）：顶栏仅保留语言切换。
+    expect(topbar.find('.prefs-menu').exists()).toBe(false);
+    expect(topbar.find('.icon-btn').exists()).toBe(false);
   });
 
   it('embed routes keep the bare shell: no .viewer-shell, no top bar, no outer padding wrapper', async () => {