Tab: Business > Cart. Options: Yes (default) / No. Global only. Relevant when you use a courier integration such as Uber Direct.

When Yes, the cart checks your own in-house delivery routes/transporters as a fallback: if no transporter of yours delivers on the chosen day, the customer sees Sorry, we do not deliver on this day and cannot pick delivery for that date. When No, that in-house availability check is skipped for courier deliveries.