Brother I'm looking right at it. I cannot set one monitor to 120% and another to 160% (both are custom values), like on KDE. If I use a custom setting it gets applied to both monitors, in fact it gets grayed out for some reason - the values don't even show properly. Only a reset button available that logs you out to reset it to 100%.
If I want to set them to different scaling factors, I have to use one of the values from the drop downs (100/125/150/175/200%), which is not what I want.
> Windows cannot do custom dpi per monitor, only a single custom dpi that gets applied to all monitors.
Here are all of my monitors at different DPIs: https://imgur.com/a/q3z2P1E . They don't have a "single DPI" that gets applied to all of them. The custom DPI setting is for changing all base system DPI.
> I cannot set one monitor to 120% and another to 160% (both are custom values), like on KDE.
Okay you're unhappy with the granularity. Yes Windows uses 25% granularity.
I don't know if this will work but you can probably do a combination of changing the base DPI and then calculating the 25%. So you can set the base DPI to something like 120 (which is 125%) and then set the other monitor to 125% which gives 156%:
I think the base DPI is stored in this registry key:
If I want to set them to different scaling factors, I have to use one of the values from the drop downs (100/125/150/175/200%), which is not what I want.