diff --git a/web/app/components/workflow/block-selector/constants.tsx b/web/app/components/workflow/block-selector/constants.tsx
index 64997036b9..92719f943f 100644
--- a/web/app/components/workflow/block-selector/constants.tsx
+++ b/web/app/components/workflow/block-selector/constants.tsx
@@ -14,6 +14,11 @@ export const BLOCKS: Block[] = [
     type: BlockEnum.LLM,
     title: 'LLM',
   },
+  {
+    classification: BlockClassificationEnum.Default,
+    type: BlockEnum.KnowledgeRetrieval,
+    title: 'Knowledge Retrieval',
+  },
   {
     classification: BlockClassificationEnum.Default,
     type: BlockEnum.End,
@@ -24,11 +29,6 @@ export const BLOCKS: Block[] = [
     type: BlockEnum.Answer,
     title: 'Direct Answer',
   },
-  {
-    classification: BlockClassificationEnum.QuestionUnderstand,
-    type: BlockEnum.KnowledgeRetrieval,
-    title: 'Knowledge Retrieval',
-  },
   {
     classification: BlockClassificationEnum.QuestionUnderstand,
     type: BlockEnum.QuestionClassifier,