I'd be glad to share insights into how audit logs work in QuickBooks Online (QBO).
The option to delete the Audit Log report isn't available in QBO. Since this feature is more important to help track all the changes made to transactions, Accounts, and Settings within the system.
Therefore, QuickBooks Online has designed the Audit Log to be an unalterable record to ensure the integrity and accuracy of the financial data.
Additionally, I've attached an article that will help you learn more about the audit log, as the special users QuickBooks creates for specific situations on your account: Use the audit log in QuickBooks Online.
I've also added some articles on how to customise, memorise, print, email, and export reports in QuickBooks: