Hello there, FL User.
I'm here to provide some additional clarification on turning off Past Due invoices.
Can you share which version of QuickBooks Desktop you're currently using? The option to turn off Past Due Stamp on invoices is only available in QuickBooks Desktop for Windows 2018 and later.
For unsupported versions, you're unable to see the option for Past Due Stam through the invoice template. I'm adding an article below for more information about what I'm referring to:
Please let me know if I can be of additional assistance by providing more details below. The Community is always here to help.