Use Redo
to reverse the last action that was undone by Undo. If you are not satisfied with the result, click Undo.
Redo only works if nothing has happened after the last Undo. For instance, if you change a palette color, then Undo and draw some crosses, then it is not possible to Redo the color change because something different has happened instead.
There are unlimited Redo steps. Redo steps are only lost when you close a design.
Shortcuts
Quick Access Toolbar:
Keys: Ctrl + Y; Alt, 7