I had found this forum post a long time ago and then lost it for a time because I forgot which key words to search for. I am posting this up on the blog so it can be easier to find, wish it was in the help file somewhere. Maybe it is… they have added a LOT in the help file in the CS2017 release.
In CS2017 R1 and newer you can disable the creation of the Default mimic inside a new group. This is SUPER handy for those of us that like to keep their databases clean.
On your ClearSCADA server find the following registry key:
Set to True by default, set it False and restart the server to disable the creation of the Default mimic in new groups. Thanks Adam Woodland for finding this and sharing it on the forums!