Hello there, @mark49.
The option to default the sort order on the Invoices page is currently unavailable in QuickBooks Online.
I can see how it would be beneficial to your company to sort the invoices into descending order and set it to default. In the meantime, the only option we have right now is to sort the Due Date or Invoice number manually into descending order everytime you'll go to the Invoices page.
I want to let you know that we're taking note of your feedback and suggestions to improve the experience we're providing.
Don't hesitate to let me know if you have other questions with the invoices page. I'll be here to help you.
