Thank you @GauravJobanputra I suspected as much but thought I would test it out. I think it makes sense that a site or facility selector would not be included in the native mobile apps which are highly focused on a user's current location; so the map would follow you around, results are sorted by proximity, etc. This is easy to forget when you work remotely and are always having to zoom/pan to campus during testing!
It would be nice if the native mobile apps would either support setting an initial extent, different than the extent of included data, or honor the default site/facility/level selection as the JS floor widget does.