The VAPOR GUI maintains a history of the last 100 actions performed in the user interface. To revert the last action, from the Edit menu click "Undo ..." (the most recent change is briefly described). After performing one or more Undo's, the Edit menu will show a "Redo ..." option, to go back to before the Undo was performed. Undo and Redo can also be performed with the ctrl-Z and ctrl-Y key combinations (on Mac, cmd-Z and cmd-Y are used).
