To undo an action
PaperPort provides an Undo feature so that you can undo your last action. For example, if you draw a line or arrow, you can use Undo to remove that annotation.
To undo an action while working either on the PaperPort desktop or in the Image View window:
On the Edit ribbon, choose Undo.
You can undo a series of actions by choosing Undo All.
You can click Undo more than once to undo several previous operations.
After you undo an operation, use Redo to redo the last operation.