When a payment has successfully been made, your cash register will show a small window with payment information such as receipt number, total amount paid, payment method (cash, card, giftcard, invoice, etc.), and email address for digital receipt.
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You can hide this window and have only a small pop up at the bottom right every time you finish a transaction. Please follow these steps:

Now every time you complete a transaction, you'll get a small pop up window on the bottom right confirming that the transaction is completed.