For Web Browser version
You may be able to undo the title or description by selecting the relevant text field and pressing Ctrl+Z (hold Control and press Z).
However, you cannot undo registration, deletion, or replacement of steps, images, or videos.
If you have accidentally edited or deleted something, please use the "Revert to published content" or "Restore from backup" features.
▼Discard unpublished changes to the Manuals (Web Browser)
https://teachme.jp/8/manuals/33088474
▼Restore manual from backup on the manual editing screen (Web Browser)
https://teachme.jp/8/manuals/9917804
For Mobile App
You cannot undo edits.
You will need to restore from a backup in the Web Browser version or manually correct the changes.