Fix: Fixed the issue that the content of the Dropdown section cannot be seen when selecting the next operator #3221 (#8918)

…be seen when selecting the next operator #3221

### What problem does this PR solve?
Fix: Fixed the issue that the content of the Dropdown section cannot be
seen when selecting the next operator #3221

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/pages/agent/canvas/node/dropdown/next-step-dropdown.tsx

@@ -53,7 +53,7 @@ function AccordionOperators() {
   return (
     <Accordion
       type="multiple"
-      className="px-2 text-text-title"
+      className="px-2 text-text-title max-h-[45vh] overflow-auto"
       defaultValue={['item-1', 'item-2', 'item-3', 'item-4', 'item-5']}
     >
       <AccordionItem value="item-1">