Why can't I change the Category?

Why can't I change the Category?

Please see the two attachments. Both servers are virtual servers and are both Domain Controllers. The only way that I can get the Active Directory dashboard to display is to set the category to Domain Controller. I was able to do this for one server, but on the 2nd server and other virtual servers I am unable to change the category. Is there another way to display the Active Directory dashboard?

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