diff --git a/packages/common/components/src/ui/lnb/index.tsx b/packages/common/components/src/ui/lnb/index.tsx
index 20376af24..650fd2474 100644
--- a/packages/common/components/src/ui/lnb/index.tsx
+++ b/packages/common/components/src/ui/lnb/index.tsx
@@ -149,13 +149,22 @@ export function LNB({
   }
 
   function MenuGroup({ item }: { item: MenuItem }) {
-    const { open: isSidebarOpen } = useSidebar();
+    const { open: isSidebarOpen, setOpen: setSidebarOpen } = useSidebar();
     const [isOpen, setIsOpen] = useState(
       defaultOpenMenuIds.includes(item.menuCd),
     );
 
+    const handleOpenChange = (open: boolean) => {
+      setIsOpen(open);
+      if (!isSidebarOpen) setSidebarOpen(true);
+    };
+
     return (
-      <Collapsible open={isOpen} onOpenChange={setIsOpen} className="w-full">
+      <Collapsible
+        open={isOpen}
+        onOpenChange={handleOpenChange}
+        className="w-full"
+      >
         <SidebarMenuItem>
           <CollapsibleTrigger asChild>
             <SidebarMenuButton