Use Undo to reverse the last action. Unlimited Undos are possible. Every time you click on Undo, the previous action is reversed. If you are not satisfied with the result of the Undo, click Redo.
Undo can remove a whole group of objects, for example a number of fill areas created at one time. To remove the last created area, click Delete Object. To remove an area that was not the last created, select it then click Delete Object.
The zoom commands cannot be reversed using Undo.
Shortcuts
Edit Toolbar:
Keys: Ctrl + Z; Alt, E, U