[BUG] Top navigation tabs missing after update to v1.2773.0

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?

Description:
After the automatic update to version 1.2773.0 (884b37), the top navigation tabs are no longer visible in the Claude
desktop app. Only the chat interface is displayed. The app was working correctly at the end of the previous workday
(April 15, 2026).

Steps to reproduce:

1. Launch Claude desktop app v1.2773.0 on Windows 11 Pro
2. Observe the top of the application window

Expected behavior:
Navigation tabs visible at the top of the app window (as in previous versions).

Actual behavior:
Top tabs are completely missing. Only the chat interface is visible.

Environment:

• App version: 1.2773.0 (884b37)
• OS: Windows 11 Pro (Build 26100)
• Issue appeared: Morning of April 16, 2026 (after overnight auto-update)

Attempted fixes (none resolved the issue):

• Window resize and maximize/restore
• App restart
• Display scaling check
• Cleared app cache

What Should Happen?

App interface to show the top tabs, Chat, work,Code

Error Messages/Logs

Steps to Reproduce

Just at open the app UI

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

app v1.2773.0

Claude Code Version

2.1.111 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

<img width="1014" height="762" alt="Image" src="https://github.com/user-attachments/assets/40ad15e9-db5d-4859-ae12-2d6b101b4917" />