Keep in mind: only admins and owners may pause/activate activities.
If you want to prevent individual activities from being included in the traffic light calculation for the measure, you can simply pause them. Later, you can reactivate the activities at any time.
Right-click on the activity you want to pause and select "Pause". You will then see that the traffic lights of the activity have been replaced by lock symbols in the respective traffic light color.
To reactivate the activity, right-click on the activity and select "Activate".