diff --git a/web/src/components/layout/PageLayout.js b/web/src/components/layout/PageLayout.js
index c52e0629..044d0913 100644
--- a/web/src/components/layout/PageLayout.js
+++ b/web/src/components/layout/PageLayout.js
@@ -115,7 +115,7 @@ const PageLayout = () => {
         {showSider && (
           <Sider
             style={{
-              position: isMobile ? 'fixed' : 'fixed',
+              position: 'fixed',
               left: 0,
               top: '64px',
               zIndex: 99,
diff --git a/web/src/hooks/useIsMobile.js b/web/src/hooks/useIsMobile.js
index 9f34b58e..08f9c5e2 100644
--- a/web/src/hooks/useIsMobile.js
+++ b/web/src/hooks/useIsMobile.js
@@ -11,5 +11,6 @@ export const useIsMobile = () => {
       return () => mql.removeEventListener('change', callback);
     },
     () => window.matchMedia(query).matches,
+    () => false,
   );
 }; 
\ No newline at end of file