Undo will undo the last performed function in a drill file. 3D remembers the last 100 changed in a drill, so there will always be a list of undo-able action to cycle through.
To Undo a function in 3D, go to the Edit menu and choose “Undo ____.” A notification will appear in the middle of your screen stating what function was undone. The Undo function will reselect performers and open the last tool that was used.
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