This isn't going to help you (sorry) but the process in our UK store is much more streamlined. It goes:
- Scan or enter items, press Checkout
That's it. As soon as the cashier presses the Checkout button, the Card Reader fires up, the customer waves a phone/watch/contactless card near the device, the payment is done and the receipt printed. No button presses by either cashier or customer.
If I enable Tips on our store, then I get the process you described above (flip to customer, customer confirms amount, customer adds tip etc) - so my guess is the tips-enablement is what takes the customer down the different path. That's probably not unreasonable, given that the actual transaction to be sent to the payment gateway by the device isn't known until the tip amount has been entered.