diff --git a/web/app/components/plugins/plugin-detail-panel/tool-selector/reasoning-config-form.tsx b/web/app/components/plugins/plugin-detail-panel/tool-selector/reasoning-config-form.tsx
index 0dae8f64e1..c77ea74c88 100644
--- a/web/app/components/plugins/plugin-detail-panel/tool-selector/reasoning-config-form.tsx
+++ b/web/app/components/plugins/plugin-detail-panel/tool-selector/reasoning-config-form.tsx
@@ -334,6 +334,7 @@ const ReasoningConfigForm: React.FC<Props> = ({
             )}
             {showVariableSelector && (
               <VarReferencePicker
+                zIndex={1001}
                 className='h-8 grow'
                 readonly={false}
                 isShowNodeName