Just a heads-up from another Quest 2 user - if you're gentle, you can push the lenses in between the 3 predefined settings, and they will stay there. This helped me a lot, since my IPD is somewhere in between the middle and the wide setting.

Only 3 options is definitely a weird choice on Oculus' part (especially since the device apparently includes a potentiometer, so it actually acknowledges in-between settings!), but at least there's a workaround.