You can reverse the changes that you make in Deep Zoom Composer one step at a time, or reverse all the actions, one at a time, since the project was last saved. On the Edit menu, both the Undo and Redo commands include a description of what action will be affected.
To undo a change
On the Edit menu, click Undo, or press CTRL+Z.
To reverse an Undo action
On the Edit menu, click Redo, or press CTRL+Y.