Tab: Business > Shipping > Require Delivery Address On Login. Options: Yes / No (default No). Global only (this setting cannot be overridden per kitchen).

When Yes, any logged-in customer (not super admins, and not while browsing the admin panel) whose profile is missing a street address, town, state or zip code sees a blocking Delivery Address popup on every customer page: Please add a delivery address so we can ship your orders, or let us know you only pick up. They can either save an address or tick I only pick up — don't ask again, after which the popup stops appearing.