Welcome to the Community. Being able to view all created invoices is a great way to ensure that all transactions are recorded in your books. QuickBooks Online makes it easy to access and review past invoices. I'd be happy to help you with this.
To access all the invoices in the account, you can click on the Sales or Invoicing tab on left navigation menu > under All Sales, click on Filter > click on the drop down menu on the Type tab and choose Invoices > click on Apply. You can adjust the date range to view the period you need.
Let me know if you have any questions, I'll be happy to help.
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