misunderstood the retract system?

did i misunderstood how the retract system really works? was accidentally taking wrong path and supposed to take path H, but i just don't see any retract button or anything.




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See in 2nd pic, that it appears green/yellow highlighted (Undo, on Apple, will be Yellow-ish, compared to advancing choices which are green), you should be able to click on 45 and it will undo you to back there.
(Edit) never mind, thought that 2nd pic was you having already taken that path.