diff --git a/static/src/styles/components/sidebar/_conversation.scss b/static/src/styles/components/sidebar/_conversation.scss
index ccf6e8c6..90143b8f 100644
--- a/static/src/styles/components/sidebar/_conversation.scss
+++ b/static/src/styles/components/sidebar/_conversation.scss
@@ -117,6 +117,7 @@
 .sidebar-nav-label,
 .conversation-search,
 .conversation-list,
+.conversation-type-switch,
 .personal-label {
   opacity: 1;
   transition: opacity 220ms ease;
@@ -126,11 +127,27 @@
 .conversation-sidebar.collapsed .sidebar-nav-label,
 .conversation-sidebar.collapsed .conversation-search,
 .conversation-sidebar.collapsed .conversation-list,
+.conversation-sidebar.collapsed .conversation-type-switch,
 .conversation-sidebar.collapsed .personal-label {
   opacity: 0;
   transition-delay: 0ms;
 }
 
+/* 收起时隐藏的可交互容器必须同时脱离指针事件与聚焦序列：
+   它们只是透明，落在 44px 图标栏宽度内的部分仍占据布局，
+   不禁止的话点击不可见区域仍会触发切换对话/聚焦输入 */
+.conversation-sidebar.collapsed .conversation-search,
+.conversation-sidebar.collapsed .conversation-list,
+.conversation-sidebar.collapsed .conversation-type-switch {
+  pointer-events: none;
+  visibility: hidden;
+  /* visibility 延迟到淡出结束后再切换，避免收起时内容瞬间消失；
+     展开时本规则不再匹配，visibility 不在基础 transition 列表中，立即恢复 visible */
+  transition:
+    opacity 220ms ease,
+    visibility 0s linear 220ms;
+}
+
 .sidebar-nav-label {
   min-width: 0;
   padding-left: 6px;