2.5.1 Undoing Commands

To undo or redo instructions, hit Edit in the top-level menu and then:

Hit Undo to reverse the last action.
Hit Undo repeatedly to reverse previous actions one by one (up to 40 instructions can be undone).
Hit Redo to re-apply an instruction that has just been undone.
To remove all distances, angles and torsion angles select Clear Measurements.

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