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Fetch the complete documentation index at: https://cometchat-22654f5b-docs-android-v6-beta2.mintlify.app/llms.txt

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In order to stop receiving updates and messages for any particular joined group, you will have to leave the group using the leaveGroup() method. 
String GUID = "GUID";

CometChat.leaveGroup(GUID, onSuccess: ( String message) {
        debugPrint("Group Left  Successfully : $message");
      },onError: (CometChatException e) {
        debugPrint("Group Left failed  : ${e.message}");
      });
ParameterDescription
GUIDThe GUID of the group you would like to leave
Once a group is left, the user will no longer receive any updates or messages pertaining to the group.

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Real-time Group Member Left Events

In other words, as a member of a group, how do I know if someone has left it when my app is running? If a user leaves a group, the members of the group receive a real-time event in the onGroupMemberLeft() method of the GroupListener class. 
class Class_Name  with GroupListener {

  //CometChat.addGroupListener("group_Listener_id", this);
  @override
  void onGroupMemberLeft(Action action, User leftUser, Group leftGroup) {
    print("onGroupMemberLeft ");

  }
}

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Missed Group Member Left Events

In other words, as a member of a group, how do I know if someone has left it when my app is not running? When you retrieve the list of previous messages if a member has left any group that the logged-in user is a member of, the list of messages will contain an Action message. An Action message is a sub-class of BaseMessage class. For the group member left event, in the Action object received, the following fields can help you get the relevant information-
  1. action - left
  2. actionBy - User object containing the details of the user who left the group
  3. actionFor - Group object containing the details of the group the user has left