It's a new feature we're working on. It will allow authors to go back to a previous revision, in case they need to restore lost progress because of bugs, errors or accidental saves.
We've hidden it for now since we found some errors to fix, but it will be back soon! :)
As an author of big guides, coding can and will mess up sometimes to the littlest things so being able to restore a previous version is a Christmas Gift.
It's a new feature we're working on. It will allow authors to go back to a previous revision, in case they need to restore lost progress because of bugs, errors or accidental saves.
We've hidden it for now since we found some errors to fix, but it will be back soon! :)
It's funny because when I took that screenshot I had 90k characters and now am at 109k.
Love the new feature, have already utilized it.