Cursor 3.1: AI applies changes directly, no keepFile/UndoFile buttons—how to enable them?

Support Help
1

Hi everyone,

After updating to Cursor 3.1, AI changes are applied directly to files automatically—I no longer see the keepFile / UndoFile buttons at the bottom of the chat to review and confirm changes before applying them.

Problem

  • Before 3.1: AI showed diff preview + Keep / Undo buttons; I could choose to keep or undo changes.

  • Now (3.1): Changes are auto-applied immediately; no keep/undo options appear.

Question

Where is the setting to re-enable keepFile / UndoFile (Keep / Undo buttons) so I can review AI changes before they’re applied? Is this a new default behavior or a bug?

Thanks for any help!

4

Hey, this isn’t a bug, it’s a setting. In 3.x, auto-keep was added. If after the update you clicked the Enable auto-keep popup, Inline Diffs gets turned off, and changes get applied without the Keep and Undo buttons.

To bring back the review UI:

Cursor Settings > Agents > Applying Changes > Inline Diffs: turn the toggle on.

If it doesn’t apply right away, toggle it off and on again, then restart Cursor.

If this fixes it, let me know. If not, tell me your Cursor version and OS and we’ll dig in.