View.RevisionsBalloonSide (Word)

Sets or returns a WdRevisionsBalloonMargin constant that specifies whether Word displays revision balloons in the left or right margin in a document. Possible return values are wdLeftMargin - Left margin, wdRightMargin - Right margin. default.

Sub ToggleRevisionBalloons() 
 With ActiveWindow.View 
 If .RevisionsBalloonSide = wdLeftMargin Then 
 .RevisionsBalloonSide = wdRightMargin 
 Else 
 .RevisionsBalloonSide = wdLeftMargin 
 End If 
 End With 
End Sub