Welcome to the Community family, @DaveDos.
I'll share some insights about closing your books in QuickBooks Online (QBO).
Closing your books helps prevent unwanted changes to your account and transactions. This locks your transactions so no one can modify them before the closing date.
Thus, all transactions that fall before the closing date are still visible in your account. It's just that editing them will be impossible since your book is closed after the transaction date.
Furthermore, you can also work with your accountant to assist you in ensuring your book is accurate. This way, you'll be guided accordingly if there are changes to be made.
In case you want to modify your closed books, please see this article for guidance: Edit your closed books.
Please keep me in the loop if you have any other questions about your books or with QBO. I'll be more than happy to help you anytime. Have a great week!
