Want to change the order of topics in Gantt view

I am new to MM(9) and am trying to make a Gantt view that goes from early steps at the top to later steps at the bottom. It seems like the order of topics in Gantt view can only be changed by moving the topics in map view. In my testing, map view reads from R to L to order the topics in Gantt view, while the time-lines in Gantt view read from L (earliest) to R (latest). It seems like map view is translating to Gantt view in the opposite way that it should, as the two charts read in the opposite directions. I am imagining (and hoping) that there is different way to order things in Gantt view.