Trigger to Lock/Unlock Player Menu

I have a course in which the learner needs to complete the exercises in the order in which they are printed so I've disabled the menu in the player. Ideally, though, I would like for them to be able to return to each lesson after they've completed it and 'bounce around' a open menu to return to various exercises and review their responses. Is it possible to create a trigger that locks the player menu as the learner navigates the course and then unlocks the menu once the course is complete?

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