4K screen is getting popular in recent years. You may see some challenge for legacy applications. Such as "Microsoft Remote Desktop Connection Manager". It's stopped developed since 2014. But it's still a useful tool for server administrators. You may see the windows overfits screen on 4K display. The fix is: Go to properties of " RDCMan.exe " " Compatibility " tab " Change high DPI settings " Uncheck " Override high DPI scaling behavior ".