diff --git a/app/static/editor.js b/app/static/editor.js
index d11f2ea..00cdfda 100644
--- a/app/static/editor.js
+++ b/app/static/editor.js
@@ -429,7 +429,7 @@ const Studio={
    if(previewController)previewController.abort();previewController=new AbortController();
    const frame=$('#sitePreview');$('#previewState').textContent='正在更新预览…';$('#previewDot').classList.add('loading');
    try{
-     const doc=await api(`/api/sites/${siteId}/pages/${page}/editor-preview`,{...req('POST',{blocks,page_template:kind,layout_mode:layoutMode,site_design:siteDesignPreview}),signal:previewController.signal});
+     const doc=await api(`/api/sites/${siteId}/pages/${page}/editor-preview`,{...req('POST',{blocks,page_template:kind,layout_mode:'replace',site_design:siteDesignPreview}),signal:previewController.signal});
      if(!editorTools.shouldAcceptPreview(page,seq,pageId,previewRequest))return;
      frame.onload=()=>Studio.highlightCanvas();frame.srcdoc=doc;$('#previewState').textContent='实时预览 · 已更新';$('#previewDot').classList.remove('loading','error');
    }catch(e){