We can also use Filters to add some colors to our Bars. Here, you can see an approach using Bar Diameters, but we can also use Partitions or Schedule Marks for this.
Once we have created the filters, we add them to the filter list. This time, we need to adjust the color with which we want to display them. For 2D views, it is enough to set the Lines color, and for section views, you also need to set the color for Cut Lines.
As I already mentioned, play with this and find the way that is most suitable for you.