The Revision History window displays change control information related to the item currently selected in the Data Grid.

 

 

The revision dates are displayed on the left. Selecting a revision will display the changes that were made to individual fields during that revision.

 

You can revert to a revision by right clicking the revision list and selecting Revert to this revision. To revert a specific field or fields, select them,  right click and select Copy selected values to current record.