To undo the last change you made in the spreadsheet, click Undo on the toolbar. You can undo multiple changes (up to 16) by clicking Undo more than once.
To undo all changes you have made to the spreadsheet since the last time you saved the Web page, close the Web page without saving it in the design program.
on the toolbar. You can undo multiple changes (up to 16) by clicking Undo