About the revert action
If you have work that was done in error, or you wish to start over, you can choose a previously-saved version by clicking Revert.
If you have topics and maps (depending on your privileges) that have been worked on, a revert icon will appear to the right of the panel for that content object. This action enables you to discard your most recent work to the topic or map, and restore it to a previous version.
To revert a selected topic or map, click the Revert icon. A dialog will appear to confirm this action. Enter revert (case does not matter), then click Revert to confirm, or click Cancel.