How might I use it?

You might want to find out what percentage of parcels were delivered late to French addresses by a particular carrier service during ISO week 40, and so, following selection of the carrier service and week, you can use the Keep Only option to exclude other data:

When you hover over the selected trade lane or week, you are given the Drillthrough option to take you through to the Late Parcels tab and see how many parcels were late for each postcode, e.g.