Undo (Ctrl+Z)

To Undo is to restore the file to its state before the previous edit function. This is useful if you want to try an edit or just make a mistake. To undo your last action press Ctrl+Z .

Note: You can undo up to 32 last actions.

Redo (Ctrl+Y)

If, after undoing, you decide that the change really was what you wanted, then you can redo.