The branching feature is now called Fork Chat, and you can access it from the ... menu on each chat message. There was an issue where this menu would disappear, but it’s been fixed in recent versions.
Can you share the exact Cursor version? 2.6 is too general. You can check via Cursor > About or by running cursor --version in the terminal.
One more thing: Fork Chat is hidden for worktree and cloud agent chats by design. I see you also reported a worktrees issue in this thread: Worktrees and multiple agents broken in Cursor 3 on Linux. If you’re testing in a worktree-linked chat, Fork Chat won’t show up there.
Please try:
Update to the latest Cursor version
Open a normal Local chat, not worktree or cloud
Check if the ... menu and Fork Chat option show up
Aha. The worktrees were the issue. It appears in a local chat but not when I use worktrees. Since I only use worktrees it would be very useful to have this feature in the worktrees workflow! Maybe we can convert this to a feature request instead then?