This information is shockingly hard to find, and redditors are as confidently, vigorously clueless and unhelpful as always.
A lot of VR mods for flatscreen games are pretty lazily thrown together, so it’s on the user to configure everything correctly. There has to be a general recommended number for first person games on the Quest 3’s display, right?
I’m sure it’ll vary from person to person since our eyes are all going to be varying distances from the display.
Estimated FOV for the Quest3 is 110 horizontal / 96 vertical so I would start somewhere in that range and tweak it to what feels right for you.