Use this menu option to undo your previous actions, starting with the most recent.
To reinstate a previous action you have undone, select Edit > Redo.
The number of times you can undo or redo an action depends on the size of the scratch file associated with ArtCAM, as well as the magnitude of your editing. For example, a sequence of small changes to a selected relief layer or bitmap layer will store more undo actions than larger modifications.
You can set the size of the scratch file in the Options panel.