My question is, can I for example, monetize youtube videos that have parts like, making of scenes of animation projects, that show the interface and some features of the toon boom harmony program?
I don’t see any reason why you couldn’t. I’ve seen plenty of videos (especially tutorials) that show all of the interface and its features. I myself have made a couple videos with the interface visible and so far nothing has happened.
TL:DR - yes you can.