Read the payment rules in the checkout.
The POS app shows which consumption type, payment method and receipt type your restaurant requires.
Under Settings → General → Payments you can see your restaurant's payment rules. This way, you'll know at the till why something is pre-selected. Nothing can be changed here; the note below states: Only changeable in the web portal (Settings → Till → Payments).

Meeting at a table and Meeting at the counter – Always in-house, Always takeaway or Staff selects with the pre-selection.
Payment Method – the payment method that the cash register actually selects during checkout. If the currently selected method is unavailable, the first available method from your list will be displayed here.
Receipt – whether always printed, shown as a QR code, printed as a QR code or sent by email, or whether the staff chooses.
Offer business meal receipt ** and Offer download QR – each Active or Inactive; including ** business meal receipt preselected and Download QR preselected.
Voucher sale, Voucher type selectable and Open automatically on redemption – what the cash register opens on redemption: Card reading, Voucher scanner or Nothing.
You configure the rules in the Web desk : set the type of meal and payment method, configure receipt issuance and receipt additions, and set up vouchers at the checkout. The checkout displays changes immediately.