Allow me to share additional information about creating invoices in QuickBooks Self-Employed (QBSE).
From the Invoice window in QBSE, you can add as many characters you want to enter in the description section. You just need to tap on the Enter tab from your keyboard to enlarge the field. I'm adding these screenshots as your visual references.
Also, this article shares the details on how to manage and create invoices in QBSE. You can read the details from here for more information.
Our help articles also contain information that will serve as your references while working with QuickBooks in the future. Feel free to open each of them as your guides in the future.
Click on the Reply button and add a comment below if you have any other questions. I'm always here to help you out. Keep safe always,@bryanbaysinger!