+1 You put it well, it's very frustrating. I hope this gets fixed soon.
A temporary workaround that I'm using is that I open two windows: one for files with previews and another for non UI files.
Dear Apple, the canvas don't have to take this much horizontal space; we always resize to fit just the device and give the rest of the space to the editor.
Topic:
Developer Tools & Services
SubTopic:
Xcode
Tags: