Revision Manager is used to manage all revision of current diagram. To open Revision Manager dialog use Revision Manager ( 
) item on Diagram tab of the Ribbon.
Revision Manager allows you to perform following actions:
Delete revision
Delete selected revision. For example some revisions are obsolete in your project. Or you made a revision at wrong point of development and do not need it.
Save model revision to file
Save selected revision to standalone file. You can use this action to restore diagram to some revision in the past: just save this revision to your current diagram file.
Open revision as temporary diagram
Open selected revision in new window to view diagram itself. It will be opened as unsaved diagram.
See also:
Diagram Functions: Diagram Versioning (Revisions) | Creating Diagram Revision | Comparing Diagram Revisions