diff --git a/web/app/components/workflow/block-selector/__tests__/main.spec.tsx b/web/app/components/workflow/block-selector/__tests__/main.spec.tsx
index b7248dcb90a..decb090ab25 100644
--- a/web/app/components/workflow/block-selector/__tests__/main.spec.tsx
+++ b/web/app/components/workflow/block-selector/__tests__/main.spec.tsx
@@ -287,6 +287,39 @@ describe('NodeSelector', () => {
     expect(screen.getByPlaceholderText('workflow.tabs.searchBlock')).toBeInTheDocument()
   })
 
+  it('isolates popup keyboard events when opened from another keyboard-managed overlay', async () => {
+    const user = userEvent.setup()
+    const handleParentKeyDown = vi.fn()
+
+    renderNodeSelector(
+      <NodeSelector
+        open
+        isolateKeyboardEvents
+        onSelect={vi.fn()}
+        blocks={[
+          createBlock(BlockEnum.LLM, 'LLM'),
+          createBlock(BlockEnum.End, 'End'),
+        ]}
+        availableBlocksTypes={[BlockEnum.LLM, BlockEnum.End]}
+      />,
+    )
+
+    const searchInput = screen.getByPlaceholderText('workflow.tabs.searchBlock') as HTMLInputElement
+    document.body.addEventListener('keydown', handleParentKeyDown)
+
+    try {
+      await user.type(searchInput, 'LLM')
+    }
+    finally {
+      document.body.removeEventListener('keydown', handleParentKeyDown)
+    }
+
+    expect(searchInput.value).toBe('LLM')
+    expect(handleParentKeyDown).not.toHaveBeenCalled()
+    expect(screen.getByText('LLM')).toBeInTheDocument()
+    expect(screen.queryByText('End')).not.toBeInTheDocument()
+  })
+
   it('disables the start tab with a setup tooltip when an unconfigured start node is on the canvas', async () => {
     const user = userEvent.setup()
 
diff --git a/web/app/components/workflow/block-selector/main.tsx b/web/app/components/workflow/block-selector/main.tsx
index 6678f081fe9..51f49d46b20 100644
--- a/web/app/components/workflow/block-selector/main.tsx
+++ b/web/app/components/workflow/block-selector/main.tsx
@@ -64,6 +64,7 @@ export type NodeSelectorProps = {
   forceEnableStartTab?: boolean // Force enabling Start tab regardless of existing trigger/user input nodes (e.g., when changing Start node type).
   allowUserInputSelection?: boolean // Override user-input availability; default logic blocks it when triggers exist.
   snippetInsertPayload?: Parameters<OnNodeAdd>[1]
+  isolateKeyboardEvents?: boolean
 }
 function NodeSelector({
   open: openFromProps,
@@ -90,6 +91,7 @@ function NodeSelector({
   forceEnableStartTab = false,
   allowUserInputSelection,
   snippetInsertPayload,
+  isolateKeyboardEvents = false,
 }: NodeSelectorProps) {
   const { t } = useTranslation()
   const nodes = useNodes()
@@ -182,6 +184,10 @@ function NodeSelector({
     if (open && newActiveTab === TabsEnum.Snippets)
       setSnippetsLoading(true)
   }, [open, setActiveTab])
+  const handlePopupKeyDown = useCallback((event: React.KeyboardEvent) => {
+    if (isolateKeyboardEvents)
+      event.stopPropagation()
+  }, [isolateKeyboardEvents])
 
   useEffect(() => {
     if (!snippetsLoading)
@@ -263,6 +269,7 @@ function NodeSelector({
         sideOffset={sideOffset}
         alignOffset={alignOffset}
         popupClassName="border-none bg-transparent shadow-none"
+        popupProps={isolateKeyboardEvents ? { onKeyDown: handlePopupKeyDown } : undefined}
       >
         <div className={cn('w-[400px] min-w-0 overflow-hidden rounded-xl border-[0.5px] border-components-panel-border bg-components-panel-bg shadow-lg', popupClassName)}>
           <Tabs
diff --git a/web/app/components/workflow/operator/__tests__/add-block.spec.tsx b/web/app/components/workflow/operator/__tests__/add-block.spec.tsx
index 98bdb241540..df06db1d948 100644
--- a/web/app/components/workflow/operator/__tests__/add-block.spec.tsx
+++ b/web/app/components/workflow/operator/__tests__/add-block.spec.tsx
@@ -20,6 +20,7 @@ type BlockSelectorMockProps = {
   popupClassName: string
   availableBlocksTypes: BlockEnum[]
   showStartTab: boolean
+  isolateKeyboardEvents?: boolean
   defaultActiveTab?: unknown
 }
 
@@ -204,6 +205,7 @@ describe('AddBlock', () => {
         showStartTab: true,
         placement: 'right-start',
         popupClassName: 'min-w-[256px]!',
+        isolateKeyboardEvents: undefined,
       })
       expect(latestBlockSelectorProps?.defaultActiveTab).toBeUndefined()
       expect(latestBlockSelectorProps?.offset).toEqual({
@@ -241,6 +243,14 @@ describe('AddBlock', () => {
       expect(latestBlockSelectorProps?.showStartTab).toBe(true)
       expect(latestBlockSelectorProps?.defaultActiveTab).toBeUndefined()
     })
+
+    it('should pass keyboard isolation to the selector when requested by the caller', async () => {
+      renderWorkflowFlowComponent(<AddBlock isolateKeyboardEvents />, { nodes: [], edges: [] })
+
+      await waitFor(() => expect(latestBlockSelectorProps).not.toBeNull())
+
+      expect(latestBlockSelectorProps?.isolateKeyboardEvents).toBe(true)
+    })
   })
 
   // User interactions that bridge selector state and workflow state.
diff --git a/web/app/components/workflow/operator/add-block.tsx b/web/app/components/workflow/operator/add-block.tsx
index e2937f28642..364c55ee93e 100644
--- a/web/app/components/workflow/operator/add-block.tsx
+++ b/web/app/components/workflow/operator/add-block.tsx
@@ -46,12 +46,14 @@ type AddBlockProps = {
   renderTriggerAsButtonRoot?: boolean
   offset?: OffsetOptions
   onClose?: () => void
+  isolateKeyboardEvents?: boolean
 }
 const AddBlock = ({
   renderTrigger,
   renderTriggerAsButtonRoot,
   offset,
   onClose,
+  isolateKeyboardEvents,
 }: AddBlockProps) => {
   const { t } = useTranslation()
   const store = useStoreApi()
@@ -183,6 +185,7 @@ const AddBlock = ({
       popupClassName="min-w-[256px]!"
       availableBlocksTypes={availableNextBlocks}
       showStartTab={showStartTab}
+      isolateKeyboardEvents={isolateKeyboardEvents}
     />
   )
 }
diff --git a/web/app/components/workflow/panel-contextmenu.tsx b/web/app/components/workflow/panel-contextmenu.tsx
index 2e620e26909..f4f37c17fbf 100644
--- a/web/app/components/workflow/panel-contextmenu.tsx
+++ b/web/app/components/workflow/panel-contextmenu.tsx
@@ -97,6 +97,7 @@ export function PanelContextmenu({
             renderTrigger={renderAddBlockTrigger}
             renderTriggerAsButtonRoot
             onClose={onClose}
+            isolateKeyboardEvents
             offset={{
               mainAxis: -36,
               crossAxis: -4,