As an administrator, you have control over the chat settings between all users and you can disable chat between two user categories. Main Menu >> Settings >> System Settings >> Chat Settings
To Disable a Chat Between Two Categories :
- Click the Chat Settings button on the System Settings page.
- Select the two user categories from the drop-down list.
- Click the Disable chat between theses users button.
- If you want to undo your action anytime, click the x mark to remove it.