As per the link https://experienceleague.adobe.com/docs/campaign-classic/using/monitoring-campaign-classic/productio... said, we can have a functional folder to audit all operations. But I can not find this folder neither some XtkAudit_Option switch.
Go to Help -> About in the client console. If server build is below 9026, this feature is unavailable.
Otherwise, should be under Admin folder, if not create it the folder type is at the top under Admin.