Using the Undo function in Word will reverse the last action performed on the document. Redo repeats the last action performed.
To Undo an action, click the Undo button
located on the Quick Access Toolbar to undo the last action performed. Clicking the button again will undo the next previous action, and so on.
The Redo function will reverse the Undo action. To Redo an action, click the Redo button
located on the Quick Access Tool Bar.
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To watch a tutorial video on how to do this, click Play on the video below.

