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Click Edit > Undo Markup or click the
Undo Markup button.
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Clicking this command one time cancels the last action you performed in the markup layer. This command removes an added element, returns a moved element to its previous location, or restores a deleted element.
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Only the last action can be canceled or undone.
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Clicking this command a second time returns the markup layer to its state before you performed the undo command, in effect performing again the action that was canceled.
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Once you click the Undo Markup command, it is replaced by the Redo Markup command, as only the last action can be reversed. Clicking the Redo Markup command performs again the action you reversed with the Undo Markup command.