Undo and Redo
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Undo
Redo
Undo 
Click on the Undo icon 
in the standard toolbar, press Ctrl+Z or select Undo in the File menu to undo the last draw or edit operation.
Redo
Click on the Redo icon 
in the standard toolbar, press Ctrl+Y or select Redo in the File menu to reverse the effect of the Undo operation.
Back to the File page.