Is Windows using a scaling factor ? That can cause issues with screen resolution requirements, see here.
I’ve used Ropieee and DietPi on the same DigiOne and can’t recall any SQ difference. I’m surprised you found installing Roon Bridge on Volumio easier than Ropieee configuration, it’s usually the other way around.
Folder view has been discussed extensively in other threads. The devs have confirmed that Roon will not be implementing it because it is incompatible with the fundamental design of the software. The Library browsers and Focus tools are intended to replace file system views, not accomodate them. For me this is a big attraction, others find it problematic. I think it does require using Roon for a while to understand the power and capability hidden under the hood of the Focus tools.
When you browse a particular Album the default action button is Play Now unless changed to Shuffle in Settings.