diff --git a/frontend-web/src/open-canvas/pages/AIWritingPage.tsx b/frontend-web/src/open-canvas/pages/AIWritingPage.tsx
index 8df94935..c403bb45 100644
--- a/frontend-web/src/open-canvas/pages/AIWritingPage.tsx
+++ b/frontend-web/src/open-canvas/pages/AIWritingPage.tsx
@@ -217,6 +217,81 @@ function AIWritingLayout({ hideAdvancedFields, initialNotebookId, initialDocumen
   );
 }
 
+/**
+ * 写作页主体（侧栏 + 内容区）。放在 Provider 内部，以便读 useAIWriting 状态：
+ * 进入写作（status !== idle 或查看历史）后自动收起左侧研究模板栏，让写作区更宽。
+ */
+function AIWritingBody({ hideAdvancedFields, initialNotebookId, initialDocumentIds, studioToken }: { hideAdvancedFields: boolean } & NotebookProps) {
+  const { state } = useAIWriting();
+  const { isHistoryMode } = useAIWritingHistory();
+
+  // 需求 0616 #5：左栏点「笔记本 / 所有空间」→ 在右侧内嵌打开对应页，替换右侧内容
+  // （写作布局不卸载，仅 display:none 隐藏，避免 WritingSetupChat 重挂丢线程）。
+  const [rightView, setRightView] = useState<RightView>(null);
+  const overlayActive = rightView != null;
+  const viewingNotebookId = rightView?.kind === 'notebook' ? rightView.id : null;
+
+  // 进入写作（开始生成 / 查看历史）后收起研究模板侧栏；嵌入态(studioToken)始终不展示。
+  const showSidebar = !studioToken && state.status === 'idle' && !isHistoryMode;
+
+  return (
+    <div className="flex-1 min-h-0 overflow-hidden flex">
+      {/* 需求 0616 #5：课题研究左栏（研究模板 + 笔记本）。进入写作后收起。 */}
+      {showSidebar && (
+        <ResearchSidebar
+          viewingNotebookId={viewingNotebookId}
+          onOpenNotebook={(id) => setRightView({ kind: 'notebook', id })}
+          onOpenAllSpaces={() => setRightView({ kind: 'allSpaces' })}
+        />
+      )}
+      {/* 右侧：写作布局常驻（仅 display:none 隐藏，避免 WritingSetupChat 重挂丢线程），
+          查看笔记本 / 所有空间时在其上叠加内嵌页。 */}
+      <div className="relative flex-1 min-h-0 overflow-hidden">
+        <div className={cn('absolute inset-0', overlayActive && 'hidden')}>
+          <AIWritingLayout hideAdvancedFields={hideAdvancedFields} initialNotebookId={initialNotebookId} initialDocumentIds={initialDocumentIds} studioToken={studioToken} />
+        </div>
+        {overlayActive && (
+          <div className="absolute inset-0 flex flex-col bg-background">
+            <div className="flex shrink-0 items-center gap-1 border-b border-border px-4 py-2">
+              <button
+                type="button"
+                onClick={() => setRightView(null)}
+                className="flex items-center gap-1.5 rounded-md px-2 py-1 text-sm text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
+              >
+                <ArrowLeft className="size-4" />
+                返回写作
+              </button>
+              {rightView.kind === 'notebook' && (
+                <button
+                  type="button"
+                  onClick={() => setRightView({ kind: 'allSpaces' })}
+                  className="ml-1 rounded-md px-2 py-1 text-sm text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
+                >
+                  所有空间
+                </button>
+              )}
+            </div>
+            <div className="min-h-0 flex-1 overflow-hidden">
+              {rightView.kind === 'notebook' ? (
+                // 笔记本详情页内部用 ChatBox(useArtifacts) → 需 ChatRuntime 提供 Provider。
+                <ChatRuntime>
+                  <StudioNotebookDetailPage key={rightView.id} notebookId={rightView.id} />
+                </ChatRuntime>
+              ) : (
+                <div className="h-full overflow-y-auto">
+                  <StudioNotebooksPage
+                    onOpenNotebook={(id) => setRightView({ kind: 'notebook', id })}
+                  />
+                </div>
+              )}
+            </div>
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}
+
 export default function AIWritingPage({
   hideAdvancedFields = false,
   initialNotebookId,
@@ -228,12 +303,6 @@ export default function AIWritingPage({
   initialDocumentIds?: number[];
   studioToken?: string;
 } = {}) {
-  // 需求 0616 #5：左栏点「笔记本 / 所有空间」→ 在右侧内嵌打开对应页，替换右侧内容
-  // （写作布局不卸载，仅 display:none 隐藏，避免 WritingSetupChat 重挂丢线程）。
-  const [rightView, setRightView] = useState<RightView>(null);
-  const overlayActive = rightView != null;
-  const viewingNotebookId = rightView?.kind === 'notebook' ? rightView.id : null;
-
   return (
     <CanvasThreadProvider>
     <CanvasGraphProvider>
@@ -247,60 +316,12 @@ export default function AIWritingPage({
       >
       <TooltipProvider delayDuration={300}>
         <div className="h-full flex flex-col overflow-hidden bg-background canvas-writing-bg">
-          <div className="flex-1 min-h-0 overflow-hidden flex">
-            {/* 需求 0616 #5：课题研究左栏（研究模板 + 笔记本）。studio 嵌入态(studioToken)隐藏。 */}
-            {!studioToken && (
-              <ResearchSidebar
-                viewingNotebookId={viewingNotebookId}
-                onOpenNotebook={(id) => setRightView({ kind: 'notebook', id })}
-                onOpenAllSpaces={() => setRightView({ kind: 'allSpaces' })}
-              />
-            )}
-            {/* 右侧：写作布局常驻（仅 display:none 隐藏，避免 WritingSetupChat 重挂丢线程），
-                查看笔记本 / 所有空间时在其上叠加内嵌页。 */}
-            <div className="relative flex-1 min-h-0 overflow-hidden">
-              <div className={cn('absolute inset-0', overlayActive && 'hidden')}>
-                <AIWritingLayout hideAdvancedFields={hideAdvancedFields} initialNotebookId={initialNotebookId} initialDocumentIds={initialDocumentIds} studioToken={studioToken} />
-              </div>
-              {overlayActive && (
-                <div className="absolute inset-0 flex flex-col bg-background">
-                  <div className="flex shrink-0 items-center gap-1 border-b border-border px-4 py-2">
-                    <button
-                      type="button"
-                      onClick={() => setRightView(null)}
-                      className="flex items-center gap-1.5 rounded-md px-2 py-1 text-sm text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
-                    >
-                      <ArrowLeft className="size-4" />
-                      返回写作
-                    </button>
-                    {rightView.kind === 'notebook' && (
-                      <button
-                        type="button"
-                        onClick={() => setRightView({ kind: 'allSpaces' })}
-                        className="ml-1 rounded-md px-2 py-1 text-sm text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
-                      >
-                        所有空间
-                      </button>
-                    )}
-                  </div>
-                  <div className="min-h-0 flex-1 overflow-hidden">
-                    {rightView.kind === 'notebook' ? (
-                      // 笔记本详情页内部用 ChatBox(useArtifacts) → 需 ChatRuntime 提供 Provider。
-                      <ChatRuntime>
-                        <StudioNotebookDetailPage key={rightView.id} notebookId={rightView.id} />
-                      </ChatRuntime>
-                    ) : (
-                      <div className="h-full overflow-y-auto">
-                        <StudioNotebooksPage
-                          onOpenNotebook={(id) => setRightView({ kind: 'notebook', id })}
-                        />
-                      </div>
-                    )}
-                  </div>
-                </div>
-              )}
-            </div>
-          </div>
+          <AIWritingBody
+            hideAdvancedFields={hideAdvancedFields}
+            initialNotebookId={initialNotebookId}
+            initialDocumentIds={initialDocumentIds}
+            studioToken={studioToken}
+          />
         </div>
       </TooltipProvider>
       </WritingFormProvider>