Undoing and redoing actions
The Undo command (Edit menu) reverses the last action performed on an item. For example, if you accidentally cut a picture box, the Undo command will bring the picture box back into the layout from the Clipboard. The Redo command (Edit menu) lets you reimplement an action you had undone.
Choose Edit > Undo (Command+Z/Ctrl+Z) to reverse the last action performed. The menu item identifies the specific action that can be undone. For example, the Undo Deletion command is available in the Edit menu after you have used the Item > Delete command. Cannot Undo displays as gray text when the Undo feature is unavailable.
To reimplement the action, choose Edit > Redo (Command+Shift+Z/Ctrl+Y) after you undo an action.