diff --git a/src/styles/bytedesk-override.css b/src/styles/bytedesk-override.css
index b479b0b1..8cd81c2c 100644
--- a/src/styles/bytedesk-override.css
+++ b/src/styles/bytedesk-override.css
@@ -12,13 +12,16 @@
 [class*="bytedesk"],
 [id*="bytedesk"],
 [class*="BytedeskWeb"] {
+  position: fixed !important;
   z-index: 999999 !important;
+  pointer-events: auto !important;
 }
 
 /* Bytedesk iframe - 聊天窗口 */
 iframe[src*="bytedesk"],
 iframe[src*="/chat/"],
 iframe[src*="/visitor/"] {
+  position: fixed !important;
   z-index: 999999 !important;
 }
 
diff --git a/src/views/AgentChat/index.js b/src/views/AgentChat/index.js
index fc752d7d..e0d1415f 100644
--- a/src/views/AgentChat/index.js
+++ b/src/views/AgentChat/index.js
@@ -1231,7 +1231,7 @@ const AgentChatV4 = () => {
                 </Badge>
               </HStack>
 
-              <Accordion allowMultiple defaultIndex={[0, 1, 2, 3, 4]}>
+              <Accordion allowMultiple defaultIndex={[]}>
                 {MCP_TOOL_CATEGORIES.map((category, catIdx) => {
                   const categoryToolIds = category.tools.map((t) => t.id);
                   const selectedInCategory = categoryToolIds.filter((id) => selectedTools.includes(id));