Welcome to the Community! I'd be more than happy to help answer your question about the Past Due stamp on invoices.
You can only see the "Overdue" display on an invoice through the Invoices page and when you click on the invoice to review a summary of the invoice (pops up over to the right). Here's some additional photos to help you out:
You can submit your feedback to our Product Developers so they can consider this in the next available update. Here's how:
Go to the Gear icon in the top right-hand corner.
Press Feedback.
Enter your suggestions.
Tap Next to submit your feedback.
I hope this helps answer your question. Feel free to reach back out if you have any other questions!