Are you cloning the display? That'll require scaling of some type.
If you want to only use the external display that should work fine, if you "close" the Surface it should be smart enough to not go to sleep and instead to just route everything to the external screen.
If you are extending, then Windows 10 has supported monitors with different DPI scaling factors for awhile as well. The option isn't that apparent. Right click desktop, display settings, you can select a monitor and set the DPI scaling on that particular display.
If you are cloning the Surface's display to an external, then yeah, you'll have a hard time about it. High DPI + different aspect ratio.
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.
Are you cloning the display? That'll require scaling of some type.
If you want to only use the external display that should work fine, if you "close" the Surface it should be smart enough to not go to sleep and instead to just route everything to the external screen.
If you are extending, then Windows 10 has supported monitors with different DPI scaling factors for awhile as well. The option isn't that apparent. Right click desktop, display settings, you can select a monitor and set the DPI scaling on that particular display.
If you are cloning the Surface's display to an external, then yeah, you'll have a hard time about it. High DPI + different aspect ratio.