We just bought the pro version, and are looking for a way to sort the legend. In one report we have 7 milestones (gates) but not all of our projects start at Gate0.
It seems like the sort order of the legend depends on the gates in the first project. If the first project only contains Gate1 and Gate2 and the second project contains all gates we get a legend looking like this:
Is there a way to manually control the sort order of the legend?