I run a surface 3 pro, not a 4, but I had this problem too. The native resolution is ridiculous. We gave them to a few staff and they all complained that they couldn't read anything - we have lots of business apps that aren't DPI aware, so they are unusable with high DPI settings. I used this https://www.reddit.com/r/Surface/comments/2pqyso/surface_pro_3_screen_resolution_tip/ and set them all to 1440x960 res with 125% DPI scaling. I find this makes most things readable and so far all our apps work fine with this level of scaling. If you're only worried about RDP, you can download version 2.2 of Remote Desktop Connection Manager, which lets you force a resolution and isn't DPI aware so it doesn't shrink everything down.