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Currently, we're unable to mark the invoice from paid to unpaid in QuickBooks Self-Employed. As a workaround, you can duplicate the said invoice and then delete the paid one.
You can personalize your invoices to pull up the data that matters most to your business. To do that, please refer to Step 1: Customize your invoices section in this article: Create invoices in QuickBooks Self-Employed.
Also, you're able to do other tasks such as printing your invoices, exporting them as PDFs, etc. To achieve this, you can navigate through the Invoices menu.
Lastly, I recommend visiting our QuickBooks Blog page to get you in the loop about the latest news and product enhancements.
You can count on me if you have more questions about managing your invoices in QuickBooks. I'd be glad to help you some more.