App is terrible to use. Will not load any data unable to fined create a new invoice.

Welcome to the Community.

I'm here to help you resolve the issue of being unable to create invoices using the QuickBooks app.

Before we proceed, I would like to ask if you are getting an error message when trying to create invoices. If so, I would appreciate it if you can specify the error. A screenshot would be great as well. Also, are you using an Android or iOS? Knowing these details would help me check if there are reports with similar issues.

In the meantime, since this is an unusual behavior of your app, I recommend resetting its data to refresh your connection.

Here's how:

Android

1. From More Options ⋮.
2. Select Settings, then click Refresh Data.
3. Choose and select Yes.

iOS

1. From the Menu ☰.
2. Select Help & Feedback.
3. Click Refresh Data, and then select Refresh.

If you still have the same issue after refreshing the data, you can uninstall and reinstall the app. Then restart your phone. Refer to this article for the steps: uninstalling and reinstalling the app.

Additionally, you can access your QBO account on your mobile device when using a browser. To know the compatible browser you can use, please read this article: QuickBooks Online access for mobile devices.

For future reference, personalize your invoice to have professional-looking sales forms. To start, please head to this article: Customize invoices on the QuickBooks Online mobile app.

Let me know if you have questions about managing invoices using the QuickBooks app. I'm always here to help. Have a great day.