Delivery cost. In the Opencart 3.0 admin panel, the delivery cost can be manually changed in the order editing form. After changing the delivery cost, the order amount is automatically recalculated.
Please note that when editing the order again, all amounts are recalculated, and the delivery cost will revert to the previous value, which is set in the delivery module, therefore it is recommended to edit the order first (if necessary), then change the delivery cost once you have saved the order.