Tried this with proton stable as well as GE-Proton, still greyed out and moonlight runs way worse. Takes like 20 seconds for the app to start, even in desktop mode. Not to mention it doesn’t even recognize the APU as having hardware graphics acceleration at all.
the HDR visualization is literally a tiling little graph that pops up in the bottom right corner to show you metadata about the HDR content you’re viewing. There is no best setting, it’s a tool to measure HDR output and each one does something differently.