Hello there, @BCAaccounting.

Thank you for getting back to us and giving us a screenshot. I'll make sure you'll be able to see the More button when opening an invoice.

Based on your screenshot, you are on the right track. You can then click the Edit Invoice button to open it. You should be able to see the More button at the bottom part of the invoice screen. See the screenshot below.

For future reference, you can read this article about recording invoice payments: Record invoice payments in QuickBooks Online.

Let me know if you have questions about managing invoices in QuickBooks Online. I'm always here to help. Have a great day.