Operator status can be assigned to one or more members, and operators can assign operator status to other members at any time. There are a handful of different settings exposed to administrators and operators:
Chat name may only be set by operators. If enabled, the name of this group chat can only be changed by operators.
Do not allow new members to join on their own. If enabled, only operators can add new members to this group chat.
Do not allow members to leave on their own. If enabled, only operators can remove members from this group chat.
Do not show group chat in list. If enabled, this group chat will be hidden from public view when users request a list of group chats.
Only approved members may talk. If enabled, only operators and members specifically given permission to speak ("voiced" members) may send messages in this groupchat.
Topics may only be set by operators. If enabled, only operators can change the topic of this group chat.