Update live preview docs for cross-window architecture

editor/live-preview.mdx

@@ -4,29 +4,33 @@
 keywords: ["preview"]
 ---
 
-Preview your documentation site in real time as you make changes in the web editor. Live previews show your site exactly as it appears when published, without creating a preview deployment.
+Preview your documentation site in real time as you make changes in the web editor. Live previews open in a separate browser window and show your site exactly as it appears when published, without creating a preview deployment.
 
-- **Content changes**: See new and edited pages.
-- **Configuration updates**: View color, theme, logo, and other changes instantly.
+- **Content changes**: See new and edited pages update instantly.
+- **Configuration updates**: View color, theme, logo, and other changes in real time.
 - **Navigation structure**: Preview how navigation items appear in the sidebar and tables of contents.
 - **Component changes**: See how components render with your content.
 
+<Note>
+  Live preview requires keeping both the editor and preview windows open. Changes sync automatically between windows as you edit.
+</Note>
+
 ## Live previews versus preview deployments
 
 Both features let you preview changes before publishing, but serve different purposes.
 
 | | Live preview | Preview deployment |
 |---------|--------------|-------------------|
 | **Speed** | Instant | Requires build time |
-| **Access** | In the editor | Shareable URL |
+| **Access** | Separate window (local only) | Shareable URL |
 | **Use case** | View changes while editing | Share with team for review |
 | **Availability** | While editor is open | Persists until closed |
 
 Use live preview for immediate feedback as you work. Create preview deployments when you need to share changes with your team or test on different devices.
 
 ## Enable live preview
 
-Click the <Icon icon="target" /> button in the toolbar to open a live preview of your site in the editor.
+Click the <Icon icon="media-play" /> button in the toolbar to open a live preview of your site in a new browser window.
 
 <Frame>
   <img
@@ -41,6 +45,12 @@
   />
 </Frame>
 
+The preview window opens alongside your editor and updates automatically as you make changes. Keep both windows open to see your edits in real time.
+
 <Note>
-  Live preview is only available for public documentation. If your documentation requires authentication, the editor displays a "Live preview unavailable" message.
+  Live preview is currently **local only** and requires keeping both the editor and preview windows open in the same browser session. For shareable previews that your team can access, [upgrade your plan](/deploy/preview-deployments) to use preview deployments.
 </Note>
+
+<Warning>
+  Live preview is not available for documentation that requires authentication. If your documentation uses auth, the preview window will not display content.
+</Warning>