1. This documentation describes how to setup chat to exclude certain attendees from chat?

2. In the Event dashboard, Click on the Event App option located on the left hand side.

3. Click on the Settings.

4. Click on "+ Add Rules" option in the Chat Settings section

5. Click on the "+ Add Rule" option.

6. Click on the "Select Kind" dropdown to view the available options

7. Click on the "No-one" option from the dropdown.

8. Click on the "Select Group" option to view available groups.

9. Select a group for the dropdown.

10. Click on the "+ Add" option to add the rule.

11. Once the rule is created it implies that No other group is allowed to chat with the selected group.

12. Click on the save option to save the settings.