Thanks for reaching out here. I'd be happy to provide some insight about invoices in QuickBooks Online!
If you've already sent the invoice to your customer, please be advised they will be able to view it. When you void/delete items from your books, you'll need to recreate them, as this cannot be undone. You can review the items by going to your Settings ⚙ and select the Audit Log.
Feel free to get in touch with us again, if you have any other questions. We're always happy to help!
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