If these options don't suit your needs, you can run the Audit Log. This report logs all the transactions and activities in QuickBooks Online. From there, you'll have to manually delete each transaction.
Click the Gear Icon at the top right.
Select Audit Log (see the screenshot below).
I'd appreciate if you can update me on how it goes. I'll be here if there's anything else you need. Wishing you continued success.
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