there’s a mention of the Auxilliary cameras option in the settings, but so far I haven’t been able to switch to the wide angle, no matter which ID I’d try.
edit: I’ve also checked Open Camera, and according to its FAQ there should be an option in settings to enable a button for switching between multiple cameras, but it isn’t there on my FP4. perhaps it’s an issue on Fairphone’s implementation of the multiple camera thingy, then.