It's extending while still using the Surface screen, and it does automatically get the DPI correct. Used to have issues with specific programs, some bits comica

It's extending while still using the Surface screen, and it does automatically get the DPI correct. Used to have issues with specific programs, some bits comically large and some comically small. That seems to have stopped, but the latest bug I've been dealing with involves a white bar along the top of one of the external monitors (always the left one, oddly) about an inch thick that renders that part of the screen unusual. Custom DPI of 100% for all monitors is the only thing that makes that stop. Seen it for two or three users out of ~35 so far. I'll say that the scaling problems have overall improved and most of the time it works. But it still breaks randomly and often enough that I notice.