diff --git a/web/app/components/workflow/nodes/_base/components/workflow-panel/index.tsx b/web/app/components/workflow/nodes/_base/components/workflow-panel/index.tsx
index 164369e64..b2a09e2f1 100644
--- a/web/app/components/workflow/nodes/_base/components/workflow-panel/index.tsx
+++ b/web/app/components/workflow/nodes/_base/components/workflow-panel/index.tsx
@@ -83,18 +83,19 @@ const BasePanel: FC<BasePanelProps> = ({
   const otherPanelWidth = useStore(s => s.otherPanelWidth)
   const setNodePanelWidth = useStore(s => s.setNodePanelWidth)
 
+  const reservedCanvasWidth = 400 // Reserve the minimum visible width for the canvas
+
   const maxNodePanelWidth = useMemo(() => {
     if (!workflowCanvasWidth)
       return 720
-    if (!otherPanelWidth)
-      return workflowCanvasWidth - 400
 
-    return workflowCanvasWidth - otherPanelWidth - 400
+    const available = workflowCanvasWidth - (otherPanelWidth || 0) - reservedCanvasWidth
+    return Math.max(available, 400)
   }, [workflowCanvasWidth, otherPanelWidth])
 
   const updateNodePanelWidth = useCallback((width: number) => {
     // Ensure the width is within the min and max range
-    const newValue = Math.min(Math.max(width, 400), maxNodePanelWidth)
+    const newValue = Math.max(400, Math.min(width, maxNodePanelWidth))
     localStorage.setItem('workflow-node-panel-width', `${newValue}`)
     setNodePanelWidth(newValue)
   }, [maxNodePanelWidth, setNodePanelWidth])
@@ -118,8 +119,13 @@ const BasePanel: FC<BasePanelProps> = ({
   useEffect(() => {
     if (!workflowCanvasWidth)
       return
-    if (workflowCanvasWidth - 400 <= nodePanelWidth + otherPanelWidth)
-      debounceUpdate(workflowCanvasWidth - 400 - otherPanelWidth)
+
+    // If the total width of the three exceeds the canvas, shrink the node panel to the available range (at least 400px)
+    const total = nodePanelWidth + otherPanelWidth + reservedCanvasWidth
+    if (total > workflowCanvasWidth) {
+      const target = Math.max(workflowCanvasWidth - otherPanelWidth - reservedCanvasWidth, 400)
+      debounceUpdate(target)
+    }
   }, [nodePanelWidth, otherPanelWidth, workflowCanvasWidth, updateNodePanelWidth])
 
   const { handleNodeSelect } = useNodesInteractions()
diff --git a/web/app/components/workflow/panel/index.tsx b/web/app/components/workflow/panel/index.tsx
index c728df97e..ccfe8fac5 100644
--- a/web/app/components/workflow/panel/index.tsx
+++ b/web/app/components/workflow/panel/index.tsx
@@ -77,6 +77,30 @@ const Panel: FC<PanelProps> = ({
   const isRestoring = useStore(s => s.isRestoring)
   const showWorkflowVersionHistoryPanel = useStore(s => s.showWorkflowVersionHistoryPanel)
 
+  // widths used for adaptive layout
+  const workflowCanvasWidth = useStore(s => s.workflowCanvasWidth)
+  const previewPanelWidth = useStore(s => s.previewPanelWidth)
+  const setPreviewPanelWidth = useStore(s => s.setPreviewPanelWidth)
+
+  // When a node is selected and the NodePanel appears, if the current width
+  // of preview/otherPanel is too large, it may result in the total width of
+  // the two panels exceeding the workflowCanvasWidth, causing the NodePanel
+  // to be pushed out. Here we check and, if necessary, reduce the previewPanelWidth
+  // to "workflowCanvasWidth - 400 (minimum NodePanel width) - 400 (minimum canvas space)",
+  // while still ensuring that previewPanelWidth ≥ 400.
+
+  useEffect(() => {
+    if (!selectedNode || !workflowCanvasWidth)
+      return
+
+    const reservedCanvasWidth = 400 // Reserve the minimum visible width for the canvas
+    const minNodePanelWidth = 400
+    const maxAllowed = Math.max(workflowCanvasWidth - reservedCanvasWidth - minNodePanelWidth, 400)
+
+    if (previewPanelWidth > maxAllowed)
+      setPreviewPanelWidth(maxAllowed)
+  }, [selectedNode, workflowCanvasWidth, previewPanelWidth, setPreviewPanelWidth])
+
   const setRightPanelWidth = useStore(s => s.setRightPanelWidth)
   const setOtherPanelWidth = useStore(s => s.setOtherPanelWidth)
 
diff --git a/web/app/components/workflow/panel/workflow-preview.tsx b/web/app/components/workflow/panel/workflow-preview.tsx
index af66a414f..2c797e05d 100644
--- a/web/app/components/workflow/panel/workflow-preview.tsx
+++ b/web/app/components/workflow/panel/workflow-preview.tsx
@@ -32,6 +32,9 @@ const WorkflowPreview = () => {
   const { handleCancelDebugAndPreviewPanel } = useWorkflowInteractions()
   const workflowRunningData = useStore(s => s.workflowRunningData)
   const showInputsPanel = useStore(s => s.showInputsPanel)
+  const workflowCanvasWidth = useStore(s => s.workflowCanvasWidth)
+  const panelWidth = useStore(s => s.previewPanelWidth)
+  const setPreviewPanelWidth = useStore(s => s.setPreviewPanelWidth)
   const showDebugAndPreviewPanel = useStore(s => s.showDebugAndPreviewPanel)
   const [currentTab, setCurrentTab] = useState<string>(showInputsPanel ? 'INPUT' : 'TRACING')
 
@@ -49,7 +52,6 @@ const WorkflowPreview = () => {
       switchTab('DETAIL')
   }, [workflowRunningData])
 
-  const [panelWidth, setPanelWidth] = useState(420)
   const [isResizing, setIsResizing] = useState(false)
 
   const startResizing = useCallback((e: React.MouseEvent) => {
@@ -64,10 +66,14 @@ const WorkflowPreview = () => {
   const resize = useCallback((e: MouseEvent) => {
     if (isResizing) {
       const newWidth = window.innerWidth - e.clientX
-      if (newWidth > 420 && newWidth < 1024)
-        setPanelWidth(newWidth)
+      // width constraints: 400 <= width <= maxAllowed (canvas - reserved 400)
+      const reservedCanvasWidth = 400
+      const maxAllowed = workflowCanvasWidth ? (workflowCanvasWidth - reservedCanvasWidth) : 1024
+
+      if (newWidth >= 400 && newWidth <= maxAllowed)
+        setPreviewPanelWidth(newWidth)
     }
-  }, [isResizing])
+  }, [isResizing, workflowCanvasWidth, setPreviewPanelWidth])
 
   useEffect(() => {
     window.addEventListener('mousemove', resize)
@@ -79,9 +85,9 @@ const WorkflowPreview = () => {
   }, [resize, stopResizing])
 
   return (
-    <div className={`
-      relative flex h-full flex-col rounded-l-2xl border-[0.5px] border-components-panel-border bg-components-panel-bg shadow-xl
-    `}
+    <div className={
+      'relative flex h-full flex-col rounded-l-2xl border-[0.5px] border-components-panel-border bg-components-panel-bg shadow-xl'
+    }
       style={{ width: `${panelWidth}px` }}
     >
       <div