How do I change graphics on GeForce Now?

[Dark Sun Gwyndolin]

I'm using the Uplay version on GFN, and I can't increase the graphics. It's currently set to 'Custom' combination; presumably from when I last played it locally; I want to set it to 'Ultra High'. For some reason, Anno 1800 needs a full restart for ANY change of the graphics settings. However, GFN detects the game closing and ends the session, so when I restart Anno manually, the graphics settings have not changed. Do I need to download Anno 1800, set the graphics to maximum to save it to my Uplay profile, then launch the game via GFN? Or is there another workaround?