Sites gives you an overview of all your buildings. You can use the search function to search for buildings with alarms, buildings you have prioritized, etc. Or you can use the search bar to search for a specific building.
In the list you get more details on the building and when you click on a building, the analytics for that building will appear and you can see all the details for that building.
If you want to move on to another building, you can use the search bar again.