Click the 
button on the quick access ribbon toolbar.
Press CTRL+Z.
To undo the last operation with the object:
Click the button on the quick access ribbon toolbar.
Press CTRL+Z.
To redo the last undone operation:
Click the 
button on the quick access ribbon toolbar.
Press CTRL+Y.
NOTE. If the and buttons are not displayed on the quick access ribbon toolbar in the desktop application, the set up panel: add the Repeat and Cancel items from the Home tab.
On working in web application, the undo/redo operations are available for:
Change data.
Format cell.
See also: