Showing, but not on Fullscreen

[TripleEYE]

The extension is set to show on all websites. Despite this, on the sit https://my.schooler.biz/ the controller over the video shows normally when not in Fullscreen, but disappears when in Fullscreen. This didn't use to be the case,,, it has started happening somewhere this last year.

If it somehow helps, the video frame source for the videos played on this website seems to be from https://assets.mediadelivery.net/

Can this please be fixed?
Do you require any more information?
Thank you