hello for my 43" 4k monitor, i usually divide my screen into 4 separate windows. so each window is about 21.5". want to ask how do i calculate the PPI? is the PPI still the same as when i view my screen on one window, meaning a 43" windows? or the PPI gets higher because i view it on a smaller window(21.5"). am asking it coz i m considering to get another 43" monitor or 4 separate 4k monitors. meaning is there any benefif if i get 4 separate 4k monitor over a 43" 4k monitor that is viewed on 4 separate windows? thanks