Hypernatural doesn't have a single Undo button. If a change didn't work out, this is how you undo it — pick the version from right before it happened and restore to that point.
Open it
Hover over any assistant message in chat, click the ⋯ menu, and select Restore version….
Browse your versions
The panel lists every restore point for this video, newest first:
Current version — what you're looking at right now
Version 1, Version 2, … — earlier restore points, with a relative timestamp
Between versions, a short description summarizes the change (e.g. "Animated shots 1-3 · Renamed the video"), with a bar indicator for how big it was — more filled bars means a bigger change.
Preview before you commit
Click any version to preview it — the player and timeline update to show that version; nothing changes yet
Click Cancel, or click anywhere on the preview, to return to your current version
Restore it
Click Restore to roll your whole video — shots, voiceover, music, and settings — back to that point.
Note: Your current version is saved first, so restoring is itself reversible — open the Versions panel again and restore back to "Current version" if you change your mind.
Summary
Open it: Hover an assistant message → ⋯ → Restore version…
What's tracked: Every action, across shots/voiceover/music/settings, with an auto-generated description and change-size indicator
Preview: Click a version to see it, with nothing changed yet
Restore: Rolls back everything; your pre-restore state is saved so you can undo the restore too
History depth: Your most recent 50 restore points