Columns display for both rooms and devices by total number, number of those that are offline, and by percentage of those that are offline. Use the arrows to the left of each column heading to sort by that column.
Clicking on an entry in the # Offline Rooms
column redirects you to the Rooms
dashboard. Clicking on an entry in the # Offline Devices or Offline Devices in Last 72 Hours
column redirects you to the Devices
dashboard. Those dashboards make available extensive detail for the offline rooms or devices at the selected location.