That's the thing. DPI scale should not cut the window. I've never seens this happen. What Win10 build are you using ? I had to reformat my system and reinstall everything. I use Win7 with 100% scale, but I haven't installed Win10 yet. GTA5 PC has micro-stuttering now even at a solid 60 fps, it was OK before the reinstall
I will install Win10 1709 Fall Creators Update (Build 16299.15) tomorrow as I can't change DPI scale in Win7 or everything goes kaboom.