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You'll have to delete each transaction manually to fix this. However, you can delete your transactions in batch. Let me walk you through how.
For invoices, here's how:
For expense and other vendor transactions, you'll have to open each one of the transactions to delete it. Please see this article for details: Void or delete transactions in QuickBooks Online.
You can also check our page for additional reference of our future task: Income and expenses.
Stay in touch if you need help with anything else. I'd be sure to jump in as soon as I can. Thanks for posting and be safe.