I'm exploring the new timeline view. I'm using labels to group tasks in this view. My Labels are numbered 1.2, 1.3, 1.4 etc but I cannot figure out how to define the order in which the labels are appearing. For example 1.4 appears at the top of the list. Then 1.1. It seems random and I would like to set the order in which the groups appear. How do I do that?