To Return a Design to a Prior State

Note: The procedure below has two pre-conditions. First, the revisions must be sorted in the correct revision sequence order, either first to last or last to first. Sorts by Author or other criteria may give undesirable results. Second, all the following revisions must be selected as a group with no breaks.

Open the Design History dialog.
Select all revisions that came after the state you want.
Select Undo.