I think the HiDPI support in Unity for Windows was only added a while after support on Mac.
The problem doesn’t only occur in wireframe mode, but any view, but it’s most visible in wireframe.
In a nutshell, when I have a window that covers 1000x1000 pixels, UnrealEngine looks like it only renders 500x500.
Since you mentioned your GPU, I tried on a different machine and it’s the same thing. This is from a Windows 10 computer with a GeForce 1060 driving a UHD display. I just downloaded the latest stable 4.21 UnrealEngine. Here’s a screenshot. The fonts in UnrealEngine are sharp, but the viewport looks pixelated. It’s essentially the same problem as on a Mac with display. (since the forum only allows 500k, I uploaded it somewhere else).
