I'll take care of this query for you.
Short of deleting the invoices (which isn't advisable), there isn't another option to close these uncollectible invoices other than recording a bad debt. This ensures that your account receivables and net income remain updated and accurate.
You can also consult your bookkeeper or accountant on how it would be best to proceed with recording these transactions.
If you have an accountant user in the company, you have them follow the steps listed in this article: Use write off invoices. This is an exclusive feature for accountants with a QuickBooks Online Accountant account.
Feel free to come back and place a post here in the Community, if you have other questions. I'll get back to you as soon as I can.