Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.87.2
• OS Version: macOS 14.4.1

Steps to Reproduce:

1. Open https://vscode.dev

2. Set user settings.json to

   {
       "window.customTitleBarVisibility": "windowed"
   }

3. Title bar is hidden.

Title bar should never be hidden by this option in VS Code Web. This configuration option is considered unknown and should have no effect in web. Other values ("auto", "never") correctly have no effect.

This causes problems when using settings sync from desktop because hiding the title bar is fine on desktop where the menu bar is still accessible, but the menu bar is part of the title bar in web and makes it inaccessible.

Version: 1.87.2
Commit: 863d258
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Safari/605.1.15
Embedder: vscode.dev