It is currently possible to ‘ridge soar’ light aircraft with the engine off in MSFS. Try the ridge of mountains to the east of Salt Lake City, with a strong wind from the west.
I’m not sure how accurately ridge lift is modelled though - it seems to take a stronger wind than I’d expect, and doesn’t seem to come into effect unless you are quite far up the slope. Without a proper sailplane, with a compensating variometer, it is hard to be sure though, as obviously most GA aircraft don’t glide very well.