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Changing the invoice from paid to unpaid is currently unavailable in QuickBooks Self-Employed. As a workaround, you can duplicate the invoice and delete the paid one.
To know more about how invoicing works in QuickBooks Self-Employed, check out this write-up: Create invoices in QuickBooks Self-Employed.
Feel free to drop me a reply below if you have any other invoice or QuickBooks concerns. I'll zip right back to help you out.