Thank you for the prompt reply, @davidmatyas. I'll answer this query about the Audit Trail report in QuickBooks Desktop (QBDT) for you. 

For audit and security reasons, the option to turn off this feature is unavailable in QBDT. I suggest you use the Condense Data utility to clear out your Audit Trail report. 

Another option I can provide is to look for a third-party app that can clear the data for you. Check out this page to see the whole list of supported third-party apps in QBDT: Apps for QuickBooks Desktop.

Tag me in a comment below if you have other questions about the Audit Trail report. I'll be around to help you out further if you need it. Have a great day!