Use the Undo tool to cancel the most recent action or a series of recent actions.
To undo a single action
 (Undo) on the 
  Quick Access toolbar.
 (Undo) on the 
  Quick Access toolbar. 
   Undo panel
 Undo panel 
 (Undo). Text notes do not have the scroll down feature for multiple undo actions. You can click Undo repeatedly to step backward through edits.
 (Undo). Text notes do not have the scroll down feature for multiple undo actions. You can click Undo repeatedly to step backward through edits.
  Revit cancels the most recent action.
To undo multiple actions:
 ).
).
Revit cancels all actions up to and including the selected action.