[BUG] VS Code extension: Claude Code can no longer be moved to the editor area / new window (second monitor)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Previously I could move the Claude Code view into the editor area (as a tab next to my files) and then use "Move into New Window" to place it on my second monitor.

Now Claude Code opens in the Secondary Side Bar, and the "Move To" context menu only offers "Primary Side Bar" and "Panel". There is no option to move it to the editor area or to a new window, so I can't put Claude Code on my second screen anymore.

What Should Happen?

Claude Code should be movable to the editor area (as an editor tab), so it can be dragged or moved into a separate VS Code window on another monitor, as it worked before.

Error Messages/Logs

Steps to Reproduce

1. Open VS Code with the Claude Code extension (Claude Code appears in the Secondary Side Bar)
2. Right-click the "Claude Code" tab header
3. Hover over "Move To"
4. Only "Primary Side Bar" and "Panel" are available; no editor area / new window option

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Version 2.1.280

Platform

Anthropic API

Operating System

Other Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/eebb218c-9d17-4b69-aeaa-440b508d62be" />

Screenshot attached showing the "Move To" menu.
Possibly related: #30793