diff --git a/apps/ai-game-creator-shell/src/view/ui-editor/components/preview/PreviewWorkspace.tsx b/apps/ai-game-creator-shell/src/view/ui-editor/components/preview/PreviewWorkspace.tsx
index 26203c35a..6bd4c674a 100644
--- a/apps/ai-game-creator-shell/src/view/ui-editor/components/preview/PreviewWorkspace.tsx
+++ b/apps/ai-game-creator-shell/src/view/ui-editor/components/preview/PreviewWorkspace.tsx
@@ -1,4 +1,5 @@
 import {
+  CANVAS_WORLD_SIZE,
   CANVAS_ZOOM_IN_FACTOR,
   CANVAS_ZOOM_OUT_FACTOR,
   canvasDisplayScaleToViewportScale,
@@ -40,12 +41,41 @@ import {
 import { type UiEditorRenderMode, UiTreeRenderer } from './UiTreeRenderer';
 import { useNodeTransformInteraction } from './useNodeTransformInteraction';
 
+/** 画布初始适配比例；调小可为浮动面板预留更多可视空间。 */
+export const UI_EDITOR_FIT_DEGREE = 0.7;
+
+function fitEditorViewport(
+  bounds: { x: number; y: number; width: number; height: number },
+  canvasSize: { width: number; height: number },
+): CanvasViewport {
+  const fit = fitViewportToBounds({ bounds, canvasSize });
+  const scale = fit.scale * UI_EDITOR_FIT_DEGREE;
+  return {
+    scale,
+    x: canvasSize.width / 2 - (bounds.x + bounds.width / 2) * scale,
+    y: canvasSize.height / 2 - (bounds.y + bounds.height / 2) * scale,
+  };
+}
+
+export type { UiEditorRenderMode } from './UiTreeRenderer';
+
 export function PreviewWorkspace({
   canvas,
+  renderMode: controlledRenderMode,
+  onRenderModeChange: _onRenderModeChange,
+  showFrame: controlledShowFrame,
+  onShowFrameChange: _onShowFrameChange,
 }: {
   canvas: UiEditorCanvasProjection;
+  renderMode?: UiEditorRenderMode;
+  onRenderModeChange?: (mode: UiEditorRenderMode) => void;
+  showFrame?: boolean;
+  onShowFrameChange?: (show: boolean) => void;
 }) {
   const { activeImage, activeImageId, previewUrls } = canvas;
+  const activePreviewUrl = activeImageId
+    ? previewUrls[activeImageId]
+    : undefined;
   const viewportElementRef = useRef<HTMLDivElement>(null);
   const viewportRef = useRef<CanvasViewport>({ x: 0, y: 0, scale: 0.5 });
   const handledFocusRequestIdRef = useRef<number | null>(null);
@@ -58,9 +88,8 @@ export function PreviewWorkspace({
   const [canvasSize, setCanvasSize] = useState({ width: 900, height: 640 });
   const canvasSizeRef = useRef(canvasSize);
   const [spaceHeld, setSpaceHeld] = useState(false);
-  const [renderMode, setRenderMode] =
-    useState<UiEditorRenderMode>('editor-overlay');
-  const [showFrame, setShowFrame] = useState(false);
+  const renderMode = controlledRenderMode ?? 'editor-overlay';
+  const showFrame = controlledShowFrame ?? false;
   const [previewTransforms, setPreviewTransforms] = useState<
     ReadonlyMap<NodeId, Node['layout']['transform']>
   >(new Map());
@@ -146,25 +175,37 @@ export function PreviewWorkspace({
     if (!logicalSize) return;
     const element = viewportElementRef.current;
     setViewport(
-      fitViewportToBounds({
-        bounds: {
-          x: 0,
-          y: 0,
-          width: logicalSize.width,
-          height: logicalSize.height,
-        },
-        canvasSize: {
+      fitEditorViewport(
+        { x: 0, y: 0, width: logicalSize.width, height: logicalSize.height },
+        {
           width: element?.clientWidth || canvasSizeRef.current.width,
           height: element?.clientHeight || canvasSizeRef.current.height,
         },
-      }),
+      ),
     );
   }, [logicalSize, setViewport]);
 
   useEffect(() => {
     if (!activeImageId || !logicalSize) return;
-    fitToCanvas();
-  }, [activeImageId, fitToCanvas, logicalSize]);
+    const element = viewportElementRef.current;
+    const canvasSize = {
+      width: element?.clientWidth || canvasSizeRef.current.width,
+      height: element?.clientHeight || canvasSizeRef.current.height,
+    };
+    setViewport(
+      fitEditorViewport(
+        { x: 0, y: 0, width: logicalSize.width, height: logicalSize.height },
+        canvasSize,
+      ),
+    );
+  }, [
+    activeImageId,
+    activePreviewUrl,
+    canvasSize.height,
+    canvasSize.width,
+    logicalSize,
+    setViewport,
+  ]);
 
   const scaleViewportFromCenter = useCallback(
     (nextScale: number) => {
@@ -243,15 +284,15 @@ export function PreviewWorkspace({
     };
     handledFocusRequestIdRef.current = request.requestId;
     setViewport(
-      fitViewportToBounds({
-        bounds: {
+      fitEditorViewport(
+        {
           x: context.rect.min[0],
           y: context.rect.min[1],
           width: context.rect.max[0] - context.rect.min[0],
           height: context.rect.max[1] - context.rect.min[1],
         },
-        canvasSize: size,
-      }),
+        size,
+      ),
     );
   }, [
     activeImageId,
@@ -385,45 +426,18 @@ export function PreviewWorkspace({
   }, [renderMode]);
 
   return (
-    <section className="flex h-full min-h-0 min-w-0 flex-col overflow-hidden bg-(--platform-body-fill)">
+    <section className="flex h-full min-h-0 min-w-0 flex-col overflow-hidden bg-[#f8f4ef]">
       {activeImage &&
       logicalSize &&
       (renderMode === 'final-preview' || previewUrls[activeImageId ?? '']) ? (
         <div className="relative min-h-0 flex-1">
-          <div className="pointer-events-auto absolute right-3 top-3 z-40 flex max-w-[calc(100%-1.5rem)] flex-wrap items-center justify-end gap-2 bg-transparent text-[10px]">
-            {renderMode === 'final-preview' ? (
-              <label className="inline-flex cursor-pointer select-none items-center gap-1.5 rounded-lg bg-white/70 px-2 py-1 text-(--platform-text-soft) shadow-sm backdrop-blur">
-                <input
-                  type="checkbox"
-                  checked={showFrame}
-                  onChange={(event) => setShowFrame(event.target.checked)}
-                  className="size-3 accent-orange-500"
-                />
-                <span>显示框线</span>
-              </label>
-            ) : null}
-            <div className="flex items-center rounded-lg border border-(--platform-subpanel-border) bg-white/70 p-0.5 shadow-sm backdrop-blur">
-              <button
-                type="button"
-                className={`rounded-md px-2 py-1 ${renderMode === 'editor-overlay' ? 'bg-blue-600 text-white' : 'text-(--platform-text-soft)'}`}
-                aria-pressed={renderMode === 'editor-overlay'}
-                onClick={() => setRenderMode('editor-overlay')}
-              >
-                编辑叠加
-              </button>
-              <button
-                type="button"
-                className={`rounded-md px-2 py-1 ${renderMode === 'final-preview' ? 'bg-orange-500 text-white' : 'text-(--platform-text-soft)'}`}
-                aria-pressed={renderMode === 'final-preview'}
-                onClick={() => setRenderMode('final-preview')}
-              >
-                最终预览
-              </button>
-            </div>
-          </div>
           <SharedCanvasViewport
             ref={viewportElementRef}
-            className="size-full focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-orange-400"
+            className="size-full select-none outline-none bg-[radial-gradient(#b8aaa0_1.5px,transparent_1.5px)]"
+            style={{
+              backgroundPosition: `${viewport.x}px ${viewport.y}px`,
+              backgroundSize: `${28 * viewport.scale}px ${28 * viewport.scale}px`,
+            }}
             role="region"
             aria-label="UI 预览画布"
             tabIndex={0}
@@ -449,16 +463,14 @@ export function PreviewWorkspace({
             onPointerUp={handlePointerUp}
             onPointerCancel={handlePointerUp}
             onWheel={handleWheel}
+            onDragStart={(event) => event.preventDefault()}
             onClick={(event) => {
               if (!(event.target as Element).closest('[data-node-id]')) {
                 canvas.clearNodeSelection();
               }
             }}
           >
-            <CanvasWorld
-              viewport={viewport}
-              worldSize={Math.max(logicalSize.width, logicalSize.height)}
-            >
+            <CanvasWorld viewport={viewport} worldSize={CANVAS_WORLD_SIZE}>
               <div
                 className="relative"
                 style={{ width: logicalSize.width, height: logicalSize.height }}
@@ -467,7 +479,7 @@ export function PreviewWorkspace({
                   <img
                     src={previewUrls[activeImageId ?? '']}
                     alt={activeImage.metadata.name}
-                    className="absolute inset-0 size-full object-fill shadow-[0_18px_50px_rgb(67_48_37_/_14%)]"
+                    className="pointer-events-none absolute inset-0 size-full object-fill shadow-[0_18px_50px_rgb(67_48_37_/_14%)]"
                     draggable={false}
                   />
                 ) : (
@@ -518,7 +530,7 @@ export function PreviewWorkspace({
             />
           ) : null}
           <div
-            className="absolute bottom-3 right-3 z-10 flex items-center gap-1 rounded-lg border border-(--platform-subpanel-border) bg-white/90 p-1 shadow-lg"
+            className="absolute bottom-4 left-[calc(50%+390px)] z-10 flex select-none items-center gap-1 rounded-lg border border-(--platform-subpanel-border) bg-white/90 p-1 shadow-lg"
             onMouseDown={(event) => {
               if (
                 event.target instanceof Element &&
@@ -527,6 +539,7 @@ export function PreviewWorkspace({
                 event.preventDefault();
               }
             }}
+            onDragStart={(event) => event.preventDefault()}
           >
             <button
               type="button"
@@ -582,23 +595,6 @@ export function PreviewWorkspace({
           </div>
         </div>
       )}
-      <footer className="flex min-h-14 shrink-0 items-center gap-2 border-t border-(--platform-subpanel-border) px-4 py-2">
-        {canvas.status ? (
-          <span className="mr-auto text-xs text-(--platform-text-soft)">
-            {canvas.status}
-          </span>
-        ) : (
-          <span className="mr-auto" />
-        )}
-        <button
-          type="button"
-          className="rounded-lg border border-(--platform-subpanel-border) px-3 py-2 text-xs disabled:opacity-40"
-          disabled={canvas.isLocked}
-          onClick={canvas.openClearDialog}
-        >
-          清空
-        </button>
-      </footer>
     </section>
   );
 }