Can I recover an invoice I just created? I hit save and now it is just gone.

Glad to have you here in the Community, @carpeargentumcoa.

Let me help manage your created invoices in QuickBooks Self-Employed (QBSE).

Once you saved an invoice in QBSE, it'll be tagged as Draft. You can go to the Invoices page and find the saved invoice with the Draft status and view it to review the information. Then, send the invoice to your customer.

I've attached a screenshot below for your visual reference.

I'm adding this article to learn more about creating invoices in QBSE: Create invoices in QuickBooks Self-Employed.

Please post a reply below if you have other concerns with your transactions in QuickBooks Self-Employed. I'll be more than happy to assist you again. Have a great day and take care always.

I'm back to check on you, @carpeargentumcoa.

Were you able to recover the invoice you created? If you need further assistance with this, you're welcome to post again or leave a reply below. We're always here to help.

Thanks for coming to the Community, wishing you and your business continues success.

I spent about two hours, creating detailed invoice for customer, then walked out of the computer for half hour. When I come back, I had to login again into QuickBooks again and my invoice was gone

couldn’t find it 

had to start over again