Это автоматический перевод.
Панель инструментов / Иконка:
Меню: Правка > Отменить [-]
Горячие клавиши: Ctrl+Z (Мак: ⌘Z) | O, O
Команды: undo | oops
This tool takes back the last change of the drawing. QCAD can take back more than one command. For example if you have just created a line and a circle and you want to undo both, use the undo command twice.