How do I download a report of items I have sold on my invoices?

Thanks for posting here, gjwilt.

Currently, QuickBooks Self-Employed have limited reports and downloading the items from invoices is unavailable. You'll want to open each invoice to see the items added and manually copy them on a spreadsheet, or look for a third-party application to track the items. 

I'm also adding this article for more details: QuickBooks Self-Employed Overview.

If you have any follow-up questions or other concerns, please feel free to visit the Community. Take care and stay safe.