The OperatorPanel shows you the current state of the group. If the lock is closed, the group is currently active and will be taken into account when you activate the alarm system.
To change the state of the group, you can click on the small lock in the ObjectPanel of the group or use the button in the OperatorPanel.
Be aware that once the alarm system is activated, you can not change the state of each alarm group. If you want to activate or deactivate a group, you will have to deactivate the alarm system first.