Hello @Karen-and-Pernell0,
As the guest pays Airbnb and not the host there's no setting for the host to specify anything about the payment.
For reservations of fewer than 28 nights the guest is usually charged the full amount at the time they book. The only exception is if the reservation qualifies for the pay less up front option offered, at its sole discretion, by Airbnb. For such reservations Airbnb charges 50% on booking and 50% a few days before checkin. The host has no input into wheather this option is offered to the guest.
For reservations of 28 nights or more the guest is charged for the first month on booking and monthly thereafter.
As the guest does not pay the host directly there is, and never has been, any circumstance when the guest pays on arrival.
The article below has some more information on payments.
https://www.airbnb.ie/help/article/92/when-am-i-charged-for-a-reservation
Steve.