Rückgängig und Wiederherstellen
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
ToDo
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.
ToDo