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I'm happy to help you delete an invoice in QuickBooks Online.
Please follow the steps I've laid out below:
Let me share this helpful article too for more details: Void or delete an invoice or other transactions.
I'm including some helpful video tutorials that help with navigating QuickBooks Online: QuickBooks Tutorials.
The steps above should help you delete an invoice. Don't hesitate to reach out to me if you have other concerns. Enjoy your day!