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Thank you for providing details about your concern, @PJBooks.
To see the total of the items on the customer's invoice, just click the Add subtotal button. Subtotal will tell the total amount of the customer's invoice even there is a payment received. I've attached a screenshot below for reference.
If in case you want to customize your invoice, you can refer to this article link: Customize invoice in QuickBooks Online.
Feel free to leave a comment below if you have further concerns. I'm always here to help. Have a good one!