From the Extras menu (hit the F6 key), select Class Entry Status to view all the classes. The total number of entries and the number actually shown can be viewed for all classes in the working show.
There is also a stand-alone program called Entry Count Display that is installed along with Horse Show for Windows. You can set up an additional computer that is attached to your network and run that program. It connects to the same database that you are entering into and continuously scrolls through the classes in the selected show for exhibitors to view.