If you’re working on a large-scale project, I wouldn’t recommend creating multiple project windows onto the same project for the purposes of showing only one of the panels. For every window you have open, Dorico has to update the music when you make an edit, and on larger projects you will start to feel this in an overall slower response time.
We don’t have any current plans to make it possible to “tear off” any of Dorico’s panels, though we are not in the business of ruling things out for all time (unless they’re ideas with absolutely no merit, which is certainly not the case here).