I will not show you how you can remove these logs.
Not only is the category retained in Event Viewer, but all the events are there as well. This can be quite annoying, not to mention misleading. it is demoted from Domain Controller to member server, the logs associated with that role remain in the Event Viewer console on that system. evt files on disk, typically located in the %SystemRoot%system32config directory. All systems running Windows have Application, Security and System logs, or categories. The Event Viewer management console has several categories depending on the roles of a server.
