Current behavior: Scrivener uses two different types of widgets: integrated panels like the Binder and Inspector, and pop-ups like the Styles panel. The two are handled differently in terms of visibility, size and location.
Expected behavior: Use docks to arrange all "text-side" UI elements such that they can be dragged, resized, popped in and out, and toggled as the user sees fit.
You should definitely post this in the Wishlist forum (maybe do a search first to see if it's already been discussed) as this would be a major UI reworking that would affect both Mac and Windows versions and is out of scope for this beta from what they've told us.
-- Devin L. Ganger, WA7DLG Not a L&L employee; opinions are those of my cat Winner "Best in Class", 2018 My First Supervillain Photo Shoot