Reversing/Reinstating the Last Modification
                                            
                                                
The Undo/Redo command reverses the most recent modification. The Undo command can be performed only once, followed by a Redo command that can be performed only once.
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To reverse the last modification, do one of the following:
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On the Edit menu, select Undo/Redo.
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On the toolbar, click the Undo/Redo button:

 
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To reinstate (redo) the modification, repeat the previous step. If the file has been saved, the Undo/Redo command becomes disabled.