[BUG] UX Issue on Windows 11 Client Interface "Cowork Tab Relocation in Windows desktop lacks visual affordance"

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?

"Cowork tab relocation in Windows desktop lacks visual affordance" and describe: used to be a clear toggle in the top middle, now a small tab top-left with no selection state, caused confusion that the feature was missing entirely.

Prompting Claude to resolve this meant an hour of registry shenanigans which were not necessary when a screen shot would have possibly resolved up front.

What Should Happen?

Retain the Chat/Cowork/Code toggle as before with visual affordance

Error Messages/Logs

Steps to Reproduce

Here's a clean repro for the bug report:

Title: Cowork tab relocation in Windows desktop client is visually indistinguishable from inactive UI chrome
Environment:

Claude Desktop for Windows, v1.3883.0.0
Windows 11 Pro, x64
MSIX install

Steps to reproduce:

Be a returning user familiar with the previous Cowork UI (toggle in the top-center of the client window with clear selection state between Chat and Cowork).
Update to Claude Desktop v1.3883.0.0 (or install fresh).
Open the app and look for the Cowork entry point.

Expected behaviour:
The Cowork entry point is visually prominent and obviously interactive, consistent with prior versions — or, if relocated, announced in release notes / onboarding so users aren't left searching.
Actual behaviour:
The Cowork toggle has been moved to the top-left of the window and rendered as a small tab with no selection indicator, no contrast against surrounding chrome, and no hover/active state that communicates "this is a mode switcher." To a returning user, the feature appears to be missing from the app entirely.
Impact:

Users conclude the feature has been removed or their install is broken.
Drives support load: multiple GitHub issues filed in the last few weeks (#48407, #49748, #50401, #50495, #50895, etc.) report "Cowork tab missing" on healthy installs — strongly suggests the same UI confusion, not actual install failures.
In my case: ~1 hour of troubleshooting, including deleting a (genuinely stale but unrelated) Windows service, before realising the tab was present but not visually recognisable.

Suggested fix:

Restore a clearly labelled, centred mode toggle, OR
Give the new tab location a visible selection indicator, higher contrast, and hover affordance so it reads as interactive.
At minimum, add a one-time "Cowork has moved" tooltip on first launch after the update.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

1.3883.0.0

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_