Undo and Redo Last Actions
The Spreadsheet allows you to undo or redo your last performed action.
To undo an action, select the File tab, and click the Undo button in the Common group (or press CTRL+Z or ALT+BACKSPACE).
To redo an action that you undid, click the Redo button in the Common group (or press CTRL+Y or ALT+SHIFT+BACKSPACE).