Anybody know if there is a way to get the old invoicing system back in the app?

You can access your QuickBooks Online (QBO) account through your web or mobile browser, onlyartservices.

Before doing so, may I ask if you've experienced any errors or specific concern while using the new invoicing system when creating invoices in the mobile app? Any extra details will assist me in resolving your situation.

Reverting to the old interface for creating invoices is unavailable. If some features are missing or functionalities that aren't supported, you can log in to your account using a web or mobile browser. From there, you can easily manage your invoices.

I’ll provide this link that will help you track your invoice payments in QuickBooks: Manage invoices and payments with the QuickBooks mobile app.

Let me know if you have any other questions. I'll be glad to assist you further.