When viewing an indicator on the map, by default you are shown all areas shaded into quintiles. It's also possible to view only the top 20% of areas shaded in the following bands: top 1%, 1-5%, 5-10%, 10-15% and 15-20%. This allows you to quickly see "hotspots" for a particular indicator.
Click the Settings button on the left of the screen.
Select Map Hotspots Only.
Click Close.