diff --git a/ui/src/conversation-panel/components/header/portal/index.vue b/ui/src/conversation-panel/components/header/portal/index.vue
index 17d964919e8..c43f04cc647 100644
--- a/ui/src/conversation-panel/components/header/portal/index.vue
+++ b/ui/src/conversation-panel/components/header/portal/index.vue
@@ -34,10 +34,10 @@ const handleNewConversation = () => (props.newConversation ? props.newConversati
 
     <div class="flex-1 flex-align-center gap-2">
       <h4 class="truncate">{{ list.currentConversation.value?.abstract || '新建对话' }}</h4>
-      <el-tag type="info">
+      <el-tag type="info" class="max-md:hidden!">
         <div class="flex-align-center gap-1">
           <ApplicationIcon :icon="list.appInfo.value?.icon" :size="18" class="shrink-0" />
-          <span v-if="list.appInfo.value?.name" class="text-sm">{{ list.appInfo.value.name }}</span>
+          <span v-if="list.appInfo.value?.name" :title="list.appInfo.value.name" class="truncate text-sm">{{ list.appInfo.value.name }}</span>
         </div>
       </el-tag>
     </div>
diff --git a/ui/src/conversation-panel/left-sidebar/conversation-list/index.vue b/ui/src/conversation-panel/left-sidebar/conversation-list/index.vue
index f7d752db136..b73bf20c848 100644
--- a/ui/src/conversation-panel/left-sidebar/conversation-list/index.vue
+++ b/ui/src/conversation-panel/left-sidebar/conversation-list/index.vue
@@ -45,7 +45,7 @@ const conversationTime = (conversation: Conversation) => relativeTimeFormat(conv
     </div>
 
     <!-- 历史列表独立滚动，应用信息和新建入口保持固定。 -->
-    <el-scrollbar class="min-h-0 flex-1 mt-1">
+    <el-scrollbar class="min-h-0 flex-1 mt-1 -mr-4" view-class="pr-4">
       <div v-if="conversations.length === 0" class="text-N600 text-center mt-4">暂无历史记录</div>
       <div v-else class="space-y-1">
         <template v-for="conversation in conversations" :key="conversation.id">
diff --git a/ui/src/conversation-panel/left-sidebar/portal-conversation-list/HistoryConversationDrawer.vue b/ui/src/conversation-panel/left-sidebar/portal-conversation-list/HistoryConversationDrawer.vue
new file mode 100644
index 00000000000..8533c64a27d
--- /dev/null
+++ b/ui/src/conversation-panel/left-sidebar/portal-conversation-list/HistoryConversationDrawer.vue
@@ -0,0 +1,97 @@
+<script setup lang="ts">
+import { ref } from 'vue'
+import ConversationApi from '@/api/chat/conversation'
+import type { PortalConversationSummary } from '@/api/types'
+import { relativeTimeFormat } from '@/utils/time'
+import { useConversationListStore } from '../conversation-list/index'
+import { usePortalConversationListStore } from './index'
+
+defineOptions({ name: 'HistoryConversationDrawer' })
+const props = defineProps<{ applicationId: string }>()
+const visible = defineModel<boolean>({ required: true })
+const portalList = usePortalConversationListStore()
+const conversationList = useConversationListStore()
+const selectedApplicationId = ref(props.applicationId)
+const keyword = ref('')
+const conversations = ref<PortalConversationSummary[]>([])
+const scrollRef = ref<{ reset: () => Promise<void> }>()
+
+// 搜索与切换智能体从第一页重新加载，分页由共享滚动组件维护。
+const loadConversations = ({ currentPage, pageSize }: { currentPage: number; pageSize: number }) =>
+  ConversationApi.getPortalConversationPage(selectedApplicationId.value, currentPage, pageSize, keyword.value.trim())
+const handleSearch = () => scrollRef.value?.reset()
+const handleApplicationChange = () => {
+  keyword.value = ''
+  return scrollRef.value?.reset()
+}
+
+// 选择历史后关闭抽屉；当前智能体复用会话切换，其他智能体通过门户导航。
+const handleSelectConversation = (conversation: PortalConversationSummary) => {
+  if (selectedApplicationId.value === portalList.currentApplicationId.value) conversationList.selectConversation(conversation.id)
+  else portalList.openConversation(selectedApplicationId.value, conversation.id)
+  visible.value = false
+}
+const isActiveConversation = (conversation: PortalConversationSummary) =>
+  selectedApplicationId.value === portalList.currentApplicationId.value && conversation.id === conversationList.currentChatId.value
+
+// 删除成功后同步侧栏，并重新加载抽屉，补齐当前筛选下的历史。
+const handleDeleteConversation = (conversation: PortalConversationSummary) => {
+  const applicationId = selectedApplicationId.value
+  const request =
+    applicationId === portalList.currentApplicationId.value
+      ? conversationList.deleteChat(conversation.id)
+      : portalList.deleteGroupConversation(applicationId, conversation.id)
+  return request.then(() => Promise.all([portalList.loadApplicationGroups(), scrollRef.value?.reset()]))
+}
+</script>
+
+<template>
+  <MkDrawer v-model="visible" title="历史对话" :size="600" :close-on-click-modal="true" :close-on-press-escape="true">
+    <div class="mb-4 flex-align-center gap-3">
+      <!-- 切换历史对话所属智能体 -->
+      <el-select v-model="selectedApplicationId" class="w-50! shrink-0" @change="handleApplicationChange">
+        <template #label="{ label }">
+          <span class="flex-align-center gap-2">
+            <ApplicationIcon :icon="portalList.applicationGroups.value.find((group) => group.id === selectedApplicationId)?.icon" :size="18" />
+            <span class="truncate">{{ label }}</span>
+          </span>
+        </template>
+        <el-option v-for="group in portalList.applicationGroups.value" :key="group.id" :label="group.name" :value="group.id">
+          <span class="flex-align-center gap-2">
+            <ApplicationIcon :icon="group.icon" :size="18" />
+            {{ group.name }}
+          </span>
+        </el-option>
+      </el-select>
+      <!-- 按历史对话摘要搜索 -->
+      <MkSearchInput v-model="keyword" class="min-w-0 flex-1" placeholder="搜索" @change="handleSearch" />
+    </div>
+    <MkInfiniteScroll ref="scrollRef" v-model="conversations" :load="loadConversations">
+      <div class="space-y-1">
+        <!-- 打开历史对话 -->
+        <MkListItem
+          v-for="conversation in conversations"
+          :key="conversation.id"
+          :active="isActiveConversation(conversation)"
+          @click="handleSelectConversation(conversation)"
+          class="px-4!"
+        >
+          <template #default="{ active }">
+            <span class="min-w-0 flex-1 truncate" :title="conversation.abstract || '新对话'">{{ conversation.abstract || '新对话' }}</span>
+            <span class="-mr-6 shrink-0 text-sm text-N500 group-hover:invisible group-focus-within:invisible" :class="{ invisible: active }">
+              {{ relativeTimeFormat(conversation.update_time || conversation.create_time) }}
+            </span>
+          </template>
+          <template #action-dropdown>
+            <!-- 删除历史对话 -->
+            <MkDropdownItem divided @click="handleDeleteConversation(conversation)">
+              <template #icon><MkIcon name="icon_delete-trash_outlined" /></template>
+              <span>删除</span>
+            </MkDropdownItem>
+          </template>
+        </MkListItem>
+      </div>
+      <template #empty><MkEmpty :type="keyword ? 'search' : 'default'" :description="keyword ? '没有匹配的历史对话' : '暂无历史记录'" /></template>
+    </MkInfiniteScroll>
+  </MkDrawer>
+</template>
diff --git a/ui/src/conversation-panel/left-sidebar/portal-conversation-list/SelectApplicationDrawer.vue b/ui/src/conversation-panel/left-sidebar/portal-conversation-list/SelectApplicationDrawer.vue
index e28218ebe77..f33ed9b32df 100644
--- a/ui/src/conversation-panel/left-sidebar/portal-conversation-list/SelectApplicationDrawer.vue
+++ b/ui/src/conversation-panel/left-sidebar/portal-conversation-list/SelectApplicationDrawer.vue
@@ -1,6 +1,5 @@
 <script setup lang="ts">
 import { ref } from 'vue'
-import { debounce } from 'lodash'
 import type { ChatApplicationProfile } from '@/api/types'
 import PortalApplicationCards from '../../components/portal-application-cards/index.vue'
 import { usePortalConversationListStore } from './index'
@@ -26,9 +25,6 @@ const loadApplications = () => {
     })
 }
 
-// 输入名称时延迟搜索，避免每个字符都发起请求
-const handleKeywordInput = debounce(loadApplications, 300)
-
 // 每次打开清空搜索条件并重新查询
 const open = () => {
   applicationKeyword.value = ''
@@ -54,20 +50,15 @@ defineExpose({ open })
     :close-on-press-escape="true"
   >
     <template #header>
-      <div class="flex w-full">
+      <div class="flex w-full flex-col gap-4 md:flex-row">
         <h4>选择智能体</h4>
-        <div class="absolute-center hidden w-85 md:block">
+        <div class="w-full md:absolute-center md:w-85">
           <!-- 搜索智能体 -->
-          <MkSearchInput v-model="applicationKeyword" @input="handleKeywordInput" />
+          <MkSearchInput v-model="applicationKeyword" @change="loadApplications" />
         </div>
       </div>
     </template>
 
-    <div class="mb-4 md:hidden">
-      <!-- 移动端搜索智能体 -->
-      <MkSearchInput v-model="applicationKeyword" @input="handleKeywordInput" />
-    </div>
-
     <div v-loading="isLoading">
       <MkEmpty
         v-if="!isLoading && applications.length === 0"
@@ -84,6 +75,7 @@ defineExpose({ open })
 /* 移动端选择智能体标题栏 */
 @media (width < 768px) {
   :global(.select-application-drawer .el-drawer__header) {
+    align-items: flex-start;
     border-bottom: none;
   }
 }
diff --git a/ui/src/conversation-panel/left-sidebar/portal-conversation-list/index.ts b/ui/src/conversation-panel/left-sidebar/portal-conversation-list/index.ts
index 58156aaa48f..0c947175549 100644
--- a/ui/src/conversation-panel/left-sidebar/portal-conversation-list/index.ts
+++ b/ui/src/conversation-panel/left-sidebar/portal-conversation-list/index.ts
@@ -8,6 +8,7 @@ export interface PortalApplicationGroup {
   name: string
   icon: string
   conversations: Conversation[]
+  count: number
   expanded: boolean
 }
 
@@ -78,12 +79,14 @@ export function createPortalConversationListStore(deps: PortalConversationListDe
   const deleteGroupConversation = async (applicationId: string, chatId: string) => {
     await removeConversation(applicationId, chatId)
     const group = applicationGroups.value.find((applicationGroup) => applicationGroup.id === applicationId)
-    if (group) group.conversations = group.conversations.filter((conversation) => conversation.id !== chatId)
+    if (group) {
+      group.conversations = group.conversations.filter((conversation) => conversation.id !== chatId)
+      group.count = Math.max(0, group.count - 1)
+    }
   }
 
   // 按名称查询可访问的智能体，全部智能体页与选择智能体抽屉各自维护搜索条件与结果
-  const fetchApplications = (keyword: string) =>
-    pageApplications(1, APPLICATION_PAGE_SIZE, keyword.trim()).then((response) => response.records ?? [])
+  const fetchApplications = (keyword: string) => pageApplications(1, APPLICATION_PAGE_SIZE, keyword.trim()).then((response) => response.records ?? [])
 
   // 全部智能体页
   const applications = ref<ChatApplicationProfile[]>([])
diff --git a/ui/src/conversation-panel/left-sidebar/portal-conversation-list/index.vue b/ui/src/conversation-panel/left-sidebar/portal-conversation-list/index.vue
index df08be58766..e89edffe265 100644
--- a/ui/src/conversation-panel/left-sidebar/portal-conversation-list/index.vue
+++ b/ui/src/conversation-panel/left-sidebar/portal-conversation-list/index.vue
@@ -1,7 +1,9 @@
 <script setup lang="ts">
+import { computed, ref } from 'vue'
 import { relativeTimeFormat } from '@/utils/time'
 import type { Conversation } from '../../core/types'
 import { useConversationListStore } from '../conversation-list/index'
+import HistoryConversationDrawer from './HistoryConversationDrawer.vue'
 import AccountMenu from '../account-menu/index.vue'
 import { usePortalConversationListStore, type PortalApplicationGroup } from './index'
 
@@ -11,6 +13,13 @@ const portalList = usePortalConversationListStore()
 const { applicationGroups, currentApplicationId, isApplicationListActive, toggleGroup } = portalList
 const { conversations, currentChatId, selectConversation, deleteChat, toggleLeftSide } = useConversationListStore()
 
+const historyApplicationId = ref('')
+const historyVisible = ref(false)
+const handleOpenHistory = (group: PortalApplicationGroup) => {
+  historyApplicationId.value = group.id
+  historyVisible.value = true
+}
+
 // 每个智能体最多展示最近 5 条会话
 const RECENT_CONVERSATION_LIMIT = 5
 
@@ -20,14 +29,11 @@ const isCurrentApplication = (group: PortalApplicationGroup) => group.id === cur
 const groupConversations = (group: PortalApplicationGroup) =>
   (isCurrentApplication(group) ? conversations.value : group.conversations).slice(0, RECENT_CONVERSATION_LIMIT)
 
-// 当前智能体的新建对话（没有选中会话）时，选中智能体本身
-const isActiveApplication = (group: PortalApplicationGroup) => isCurrentApplication(group) && !currentChatId.value
+const groupConversationCount = (group: PortalApplicationGroup) =>
+  Math.max(group.count, isCurrentApplication(group) ? conversations.value.length : group.conversations.length)
 
-// 选中智能体进入其新建对话，并展开其会话；进入后会话以会话列表 Store 为准，无需查询分组会话
-const handleSelectApplication = (group: PortalApplicationGroup) => {
-  group.expanded = true
-  portalList.openApplication(group.id)
-}
+// 仅展示有历史记录的智能体，随当前会话的新建、删除同步更新。
+const historyApplicationGroups = computed(() => applicationGroups.value.filter((group) => groupConversations(group).length > 0))
 
 const isActiveConversation = (group: PortalApplicationGroup, conversation: Conversation) =>
   isCurrentApplication(group) && currentChatId.value === conversation.id
@@ -40,7 +46,7 @@ const handleSelectConversation = (group: PortalApplicationGroup, conversation: C
 }
 
 const handleDeleteConversation = (group: PortalApplicationGroup, conversation: Conversation) => {
-  if (isCurrentApplication(group)) deleteChat(conversation.id)
+  if (isCurrentApplication(group)) return deleteChat(conversation.id).then(() => portalList.loadApplicationGroups())
   else portalList.deleteGroupConversation(group.id, conversation.id)
 }
 </script>
@@ -83,14 +89,14 @@ const handleDeleteConversation = (group: PortalApplicationGroup, conversation: C
     </div>
 
     <!-- 历史列表独立滚动，门户入口和新建入口保持固定。 -->
-    <el-scrollbar class="min-h-0 flex-1 mt-1">
-      <div v-if="applicationGroups.length === 0" class="text-N600 text-center mt-4">暂无历史记录</div>
+    <el-scrollbar class="min-h-0 flex-1 mt-1 -mr-4" view-class="pr-4">
+      <div v-if="historyApplicationGroups.length === 0" class="text-N600 text-center mt-4">暂无历史记录</div>
       <div v-else class="space-y-1">
-        <template v-for="group in applicationGroups" :key="group.id">
+        <template v-for="group in historyApplicationGroups" :key="group.id">
           <MkCollapse
             :expanded="group.expanded"
             trigger="header"
-            trigger-class="group rounded-md p-2 hover:bg-N900/10"
+            trigger-class="group rounded-md p-2 hover:bg-N900/10 mb-1"
             indicator-position="after"
             @update:expanded="toggleGroup(group.id)"
           >
@@ -127,7 +133,7 @@ const handleDeleteConversation = (group: PortalApplicationGroup, conversation: C
               </div>
             </template>
 
-            <template v-if="group.expanded">
+            <div class="space-y-1" v-if="group.expanded">
               <MkListItem
                 v-for="conversation in groupConversations(group)"
                 :key="conversation.id"
@@ -156,11 +162,30 @@ const handleDeleteConversation = (group: PortalApplicationGroup, conversation: C
                   </MkDropdownItem>
                 </template>
               </MkListItem>
-            </template>
+              <!-- 超过5条 查看更多 -->
+              <MkListItem class="pl-8!" v-if="groupConversationCount(group) > RECENT_CONVERSATION_LIMIT" @click="handleOpenHistory(group)">
+                <template #default>
+                  <span>查看更多</span>
+                  <span>
+                    ({{
+                      groupConversationCount(group) - RECENT_CONVERSATION_LIMIT > 99
+                        ? '99+'
+                        : groupConversationCount(group) - RECENT_CONVERSATION_LIMIT
+                    }})
+                  </span>
+                </template>
+              </MkListItem>
+            </div>
           </MkCollapse>
         </template>
       </div>
     </el-scrollbar>
+    <HistoryConversationDrawer
+      v-if="historyApplicationId"
+      v-model="historyVisible"
+      :application-id="historyApplicationId"
+      @closed="historyApplicationId = ''"
+    />
     <!-- 账户入口固定在侧栏底部，不随历史列表滚动。 -->
     <div class="mt-3 shrink-0">
       <AccountMenu />
diff --git a/ui/src/conversation-panel/main/portal-application-panel/index.vue b/ui/src/conversation-panel/main/portal-application-panel/index.vue
index b4dfa5334b9..1b5fa234e7a 100644
--- a/ui/src/conversation-panel/main/portal-application-panel/index.vue
+++ b/ui/src/conversation-panel/main/portal-application-panel/index.vue
@@ -1,6 +1,5 @@
 <script setup lang="ts">
 import { onMounted } from 'vue'
-import { debounce } from 'lodash'
 import { useConversationListStore } from '../../left-sidebar/conversation-list/index'
 import { usePortalConversationListStore } from '../../left-sidebar/portal-conversation-list/index'
 import PortalApplicationCards from '../../components/portal-application-cards/index.vue'
@@ -9,10 +8,7 @@ defineOptions({ name: 'PortalApplicationPanel' })
 
 const { leftSideOpen, toggleLeftSide } = useConversationListStore()
 const portalList = usePortalConversationListStore()
-const { applications, applicationKeyword, isApplicationsLoading, loadApplications, openApplication, newConversation } = portalList
-
-// 输入名称时延迟搜索，避免每个字符都发起请求
-const handleKeywordInput = debounce(() => loadApplications(), 300)
+const { applications, applicationKeyword, isApplicationsLoading, loadApplications, openApplication } = portalList
 
 onMounted(() => {
   loadApplications()
@@ -22,7 +18,7 @@ onMounted(() => {
 <template>
   <!-- 全部智能体主面板:头部 + 智能体卡片列表 -->
   <main class="mk-conversation-main">
-    <header class="flex-align-center shrink-0 gap-2 px-4 py-3">
+    <header class="flex-align-center shrink-0 gap-2 px-4 py-3 max-md:flex-wrap max-md:gap-y-4">
       <!-- 左侧收起时才在顶部显示:展开左侧 + 新建对话(展开时它们在侧栏内) -->
       <template v-if="!leftSideOpen">
         <!-- 展开左侧 -->
@@ -35,7 +31,8 @@ onMounted(() => {
         <el-divider direction="vertical" />
       </template>
       <h4 class="min-w-0 flex-1 truncate">智能体</h4>
-      <MkSearchInput v-model="applicationKeyword" class="w-50!" placeholder="搜索" @input="handleKeywordInput" />
+      <!-- 搜索智能体 -->
+      <MkSearchInput v-model="applicationKeyword" class="w-full! md:w-50!" placeholder="搜索" @change="loadApplications" />
     </header>
 
     <el-scrollbar v-loading="isApplicationsLoading" class="min-h-0 flex-1 p-4 pt-0!">
diff --git a/ui/src/views/VIEW_README.md b/ui/src/views/VIEW_README.md
index 84db908ebbe..9dc29233e6c 100644
--- a/ui/src/views/VIEW_README.md
+++ b/ui/src/views/VIEW_README.md
@@ -488,3 +488,5 @@ View 负责路由、资源与模式、图加载、保存／发布／调试编排
   同目录的 `UserPwdDialog.vue` 修改当前对话用户密码，`ApiKeyDialog.vue` 展示门户地址及用户唯一 API Key，支持复制完整密钥和重新生成；密钥在界面中仅显示末四位。
   门户首页默认进入全部智能体列表，不自动选择智能体；没有当前智能体时不查询其信息／会话、禁用输入，无可用智能体显示空态。
   全部智能体与选择抽屉复用卡片，抽屉每次打开重新查询，搜索状态独立。
+  门户历史侧栏仅展示有历史的智能体及最近 5 条会话，剩余数量取分组总数；“查看更多”打开历史对话抽屉，
+  支持切换智能体、摘要搜索、滚动分页及打开／删除会话，删除后同步刷新侧栏。