Hi Rebeccareay,
Sorry for the delay in response.
I have checked your account with the email address that you have used to login on forums.
You have Adobe Sign individual account which does not have an option to remove the audit trail from the final document.
The setting to disable the Audit report from being attached to the final document is only available in Enterprise or business account.
As you have mentioned above that you are working from a business account.
It seems that you are using the account for your business, however, it is not an Adobe Sign business account.
Please refer to this link Adobe Sign plans for individuals and businesses | Adobe Document Cloud for further information on the type of accounts.
Hope that helps.
Let us know if you are referring to another account or if you need any help.
Regards,
Meenakshi