Click on the blue triangle arrow in front of an Activity to display its events on the Recent Usage tab.
Each event has a separate Details link that you can follow if you are only interested in a particular event's resource usage.
You will be brought to the Resource Register tab where you can view the registered resource usage of the event.
You can also filter down further by a Client, or display only a particular type of resource with the help of the Cabinets drop-down.