Undoing and redoing actions 
You can undo or redo the last set of actions that you performed while working on your movie.
To undo the last action
•	Click the 
Undo button 

 on the 
Toolbar.
 To redo the last undone action
•	Click the 
Redo button 

 on the 
Toolbar.
 You can adjust the number of undo levels in the Preferences dialog box.
You can also use the keyboard shortcuts [Ctrl + Z] and [Ctrl + Y] to undo and redo actions respectively.