You can undo and redo changes to objects that have been manipulated (e.g., reshaped, resized, moved) while in configuration mode.
After making one or more changes to an object, select Undo from the Edit menu.
If necessary, continue undoing your changes until you are satisfied. You can unto changes until the object is cleared from the display.
After undoing one or more changes to an object, select Redo from the Edit menu.
If necessary, continue redoing your changes until you are satisfied.
