Previous: Ranks and columns
These appear under the topics below the Current Topic to emphasize their grouping.
If you like to use different colors for topics, the color of the parent topic of each group will be used to tint the footprints. Try the Festival skin (right) to see this in 3D.
You may hide the large gray Current Topic footprint, and if you wish, also the Current Topic's child footprints. To do this, go to: Tools menu | Options panel | Appearance tab | there, two checkboxes let you hide the Current Topic or the topic group footprints.