i just got cubase 10.5 and you STILL can’t move and delete tracks in the mixer window. this is madness. it’s a joke, it’s like a car not having a steering wheel or PT not having a click track what the hell is going on how are you supposed to work, and don’t say use a completely different window (arrangement) where everything isn’t the same or in the same place because that’s utterly stupid.
Based on the restrictions in your post, I can only tell you that it is possible if you do something “utterly stupid”
I’d say you should use a completely different window (arrangement)!