There's a specific setting you can adjust on your Panasonic Toughpad, Dominic. While QuickBooks doesn't have a dedicated setting to prevent the keyboard from appearing when raising an invoice and pressing on product/service, I will guide you to Windows 11 Support for assistance in navigating the settings.
You can visit the Windows Support through this website: Microsoft Support.
For more details about creating an invoice and how to review unpaid invoices, kindly check this article: Create and send an invoice in QuickBooks.
Furthermore, here are a few articles that you can look up to when recording payments manually or letting your customers pay them online:
Let us know if you need more assistance with QuickBooks invoicing by clicking the Reply button and leaving a comment. We'll make sure to respond to you as soon as possible. Have a great weekend and more power with your business.