Currently display size in the monitor configuration setting is fully dependent on the resolution. Meaning a 2160p display is exactly 4x the size of a 1080p window. That 4k display is not exactly 4x the physical size as the 1080p monitor. It would be really neat if we could assign a specific screen size to each display, so that when we shift our mouse cursor from one display to the other, it shows up exactly as high (if monitors are left-right from each other) or exactly as wide (if monitors up-down from each other), assuming the user positioned the monitors correctly in the monitor configuration setting.