Opening too many tabs causes the agent sidebar to close

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Opening too many tabs causes the agent sidebar to close.

This happens when I’m in standard IDE mode, but not every time. For example, when I’m reviewing files in the Git history, I open too many files and the agent sidebar closes without my intention, and the ‘Toggle Agents’ option in the top-right corner switches to the off position. I then have to manually reopen it myself.

Steps to Reproduce

Open many tabs in standart ide mode

Operating System

MacOS

Version Information

Version: 3.2.11
VSCode Version: 1.105.1
Commit: e9ee1339915a927dfb2df4a836dd9c8337e17cc0
Date: 2026-04-24T14:36:47.933Z
Layout: editor
Build Type: Stable
Release Track: Default
Electron: 39.8.1
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0
OS: Darwin arm64 24.6.0

Does this stop you from using Cursor

No - Cursor works, but with this issue

Hey, thanks for the report. This looks like a known class of bugs related to the agent panel not being sticky, but the exact trigger is still unclear. In your case it sounds like it can happen just from opening tabs in IDE mode without switching modes, and we can’t reproduce it consistently yet.

To investigate properly, could you share a couple details:

  1. About how many tabs are open when the sidebar collapses? Is there a threshold?
  2. Does it happen when you open a new tab, when you close a tab, or after some time?
  3. Does it only happen in the Git history workflow, or do you see it during normal file work too?
  4. If you can catch it, a short video or GIF would help a lot.

Also, after the sidebar closed, did you switch layout or mode before that editor ↔ agent, or were you in IDE mode the whole time?

We’re tracking this issue, but I can’t share an ETA for a fix yet. Once we have a reliable repro, it’ll be much easier to move it forward.