I forgot to mention that in the Parallels settings, under Hardware -> Video, I've checked the box for 'Enable Retina Resolution', but I haven't seen a difference, even after logging out & back in and shutting down the vm and restarting it. I realize this is a preview build of Windows 10, I just want to make sure I'm not missing something. Or has anyone tried this with bootcamp and had different results? It could be the drivers from Parallels. Is there anything else I can do to increase the display resolution/quality? Should I be able to choose a higher resolution since my retina display is 2560x1600? I've set it to the highest available (1920x1200) and changed the 'text, app, and other items' size to 125% but it doesn't look as crisp as everything on the Mac side. I managed to set the scaling to 100 through some configuration tips here, but the resolution keeps changing as soon as I resize the Windows window. When I first installed, the resolution was set very low by default so I went to change it but noticed the highest resolution I can pick is 1920x1200. I run Windows 10 through Parallels 13 on my Mac, and need to set the resolution to 1920x1080 (scaling 100), in order to fix a problem with a Windows-based program.

I've got a 13' retina Macbook Pro, running Windows 10 on Parallels. I've seen several posts about Windows 10 (and 8/8.1) scaling up on retina Macbooks, but none really outlining everything or answering my question directly.