How can I remove those details from the screen? https://photos.app.goo.gl/ZTbpuzibveCqzWZk6

Push the * key when you have Netflix playing a movie/TV show.

Actually, you have to press the * button while you are still in the browse section. Roku changed the behavior of the * button during playback (or maybe Netflix did), but for most players hitting the * button during playback just opens a selection menu.