What is a drill down chart?
Drilling down gives you a way to reveal additional levels of detail within a chart. For example, suppose you want to report on sessions by country, and sessions by city. Rather than include two charts in your report, you can include a single chart with drill-down enabled. When drill-down is enabled on a chart, you can.
How does drill down work in data studio?
In the data panel of your chart, you will see a drill-down toggle button in the dimension section. Click on the toggle button to enable Drill down. Once enabled, drill down allows you to add more dimensions to your chart. List the dimensions in order from most broad to most specific.