With its help, you are able to cancel/repeat your last steps in 2D Takeoff.
The Undo and Redo buttons are available in the bottom right corner of your drawing. You can cancel or repeat up to 25 actions during the current session. If you refresh the page or re-open the project, the Undo and Redo options will be reset.
To undo previous actions, press Ctrl + Z until you reach the action you need to undo. If you prefer the mouse navigation, but not the keyboard shortcuts, press "Undo" at the bottom of the drawing.
To repeat the cancelled action, press Ctrl + Y or Ctrl + Shift + Z or press "Redo" at the bottom of the drawing.
Both the "Redo" and "Undo" buttons appear in the menu only after at least one action is completed.