When you select a group, Hyperglance shows you the group dashboard with 'Summary', 'Attributes' and 'Alarms' tabs.

The 'Summary' tab is initially what you see, and gives you a list of all the entities contained within that group:

Use the tabs to display an inventory list (as above) or to display donut charts about either alarms of the entities or running states of the entities:

When viewing donut charts about the alarms or states

The big number in the center of the donut is the total number of entities. You can see percentages by hovering.

You can click on any entry or donut chart to display an inventory table listing all corresponding entities contained within this group:

You can conduct advanced searches against this table which is explained in detail here and you can create a diagram view that display them by using the 'Show in Diagram' button.