Custom DPI scale rule

Hi all,

I’m trying to get my head around a feature which I couldn’t find any documentation for: the Custom option for DPI scaling rule. I’m running into unexplainable issues with DPI scaling (it shows fine in the editor when I set the resolution the target platforms, in my case different iPhone models, but when I actually launch on the devices themselves the scaling is 1. completely different from what it shows in the editor and 2. broken (way too small, looking like it’s taking the wrong axis or running at half resolution).

Having wasted several Sunday hours on this I’m desperately looking to find a resolution, and was hoping I could find one in this Custom option for DPI scaling. Perhaps something that I can indicate the desired DPI for each individual device.

Does anyone know how Custom DPI scaling works?

Thanks so much