Your comments

I've edited manualy the Sessions db, set the group in the "CustomProperty1" and it works, but I hope this is not going to be the new way to add a session to a group...

Same in latest version 19.0.23665.7058, when I edit a session only the name can be modified, but it not asks for the group.

+1 control the access during off hours is going to be a must with the new regulations.