I think I know why and how, I will explain later with screenshots when I am by the monitor.
I have setting options beyond the 2560x1440 (recommended) in display option
48TB Node 304 / i5-3570 / Server 2016 Essentials
12TB HP Mediasmart EX 495 (E8400, 3.0GHZ, 4GB Mushkin), with Server 2016 Essentials
16TB Qnap TS-459 Pro