@caesar2164 its good that you found this control while scouring the views with a screenreader. 

To @frrrances' point, I don't think this is the time/pull request to release this functionality to **all** of our users as its something none of us knew about. In addition, I don't think this particular feature has direct benefits to our assistive tech-based users (as it just hides a menu visually).

The fact that you were able to find it with a screenreader is the real reason to address this. Given that and the thoughts above, my suggestion would be to remove the control from the DOM so that an unpublicized/communicated feature is discoverable (and potentially confusing). Can you remove this control and if Stanford/edX finds value in the control overall, we can bring it back up in a future branch?