MacOS: XDR? HDR? Display settings in geforce now on MacBook Pro internal displays

Hi! Looking for some information on how high dynamic ranges function with GFN on MacBooks (M4 Pro).

Many games seem somewhat dark when I play them using HDR in GFN. Everything is ON, stream reports that HDR is ON etc.

The difference I've found relates to the standard XDR implementation. When I change the display settings in the macOS system settings from Apple XDR Display to HDR video, the games appear brighter overall, in-game HDR sliders function as expected etc. With XDR on in the display settings, I can never get that clear HDR-effect, for lack of a better word.

I am inexperienced with HDR (as you can probably tell from the description). Any savvy HDR GFN MacBook Users that can help a guy out here?