In Exploration mode, when creating a bar chart, the legend is sorted alphabetically, which may not be the same order that the bars are displayed. It would be nice if the order of the legend and the display could be synced up. In Report mode, the legend is in the same order as the bars are displayed. But when I'm exporting an Exploration as a Report, the only way to overcome this limitation (and keep calculated items) is to create a new bar chart.