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You can pull up the Transaction List by Customer report to track emailed estimates and invoices in QuickBooks Online (QBO). I'll guide you how.
You might want to check this article for more details about customizing reports in QBO.
To save the report's current customization settings, you can memorize it in QBO.
We're always around if you have any other concerns. Have a good day.
Explore this estimate/invoicing app with more features and integrate it with your QBO.
Hope it helps.