I really like that in Theater Mode you can press view and open the Now Playing assistant. The problem is that the assistant opens as a floating window and looks a bit "ugly" or out of place compared to the beauty that is the the theater view. What I suggest is an option (maybe by default) to have the now playing assistant integrated into Theater Mode.
Here is a mockup (forgot to include the tabs
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The mockup is as basic as it gets. The real thing should have transparency and all the appropriate eye-candy so it blends well with the rest of the elements inside the Theater Mode View