Nope. That is the default main dashboard. It does show you, over on the right side, how many app server sessions are running (unless you're on an ancient, obsolete and unsupported release of Progress).
For app servers you need to first define them (because everyone has different name for their app servers). To do that you edit etc/appsrv.cfg. There are instructions inside the .cfg file but, to summarize, if you want to monitor an app server named "xyzzy" add the following line:
apsv xyzzy "asbman -i &1 -q"
You do NOT need to define lines for the admin server, name server or webspeed unless you have those components installed and want to monitor them (I mostly wouldn't bother with admin server and name server).
Then restart ProTop and type "@". You can dismiss the UIO, Table & Index activity displays if you have a small window. (Type the "u", "t" and "i" commands to do that.)
FWIW -- I doubt that your app servers are "hung". It's more likely that all of your agents are busy executing requests and that new connections are timing out waiting for an available agent. But that should be obvious once you start monitoring.