If you have multiple locations, referrals can be turned on/off on a location-by-location basis. The referral configuration will be the same for all active locations.
After your referral program has been published, go to HQ settings. Use the Opt-In Status toggles to turn the program on or off.
Referrals are currently in Early Access, with additional release details to be announced soon.
Opt-out locations will see the referral tab in the mobile app, but will state "Referrals are not available at this location."