Geforce Now has two modes to play a game “ready to play” and “install to play” - the first one is currently used for Warthunder and you cant load or save your settings, so you need to change everything every time. Graphics, game options, key bindings, … EVERY F TIME. To be honest, why are you putting effort into this GFN release when you cant handle this HUGE problem?
But there is now the second option, which uses a persistent storage - saving should now be possible.
So please, please ask the intern responsible for the Geforce now release if the can fix the save/load problem with a cloud, change the steam version (in GFN) so it works with our normal accounts or change to “install to play”.