Blog Entry of 2009-Aug-20 in PRTG 7
New Features in PRTG 7.2: The New "S" View for Groups
Have a look at this screenshot:
This view initially hides all the individual sensors to achieve a compact overview. The device colors display a summary of the sensor states, i.e. a device shown in red has at least one sensor in error state, yellow means there is at least on sensor in warning state, etc.
The sensors are only shown "on demand": As soon as you hover your mouse pointer over a device all the sensors of the device are shown (look at www.photomeister.com in the screenshot).
Simply click the "S" link on the top right of your groups page to switch to this new display mode. Clicking "M" brings you back to the default mode.