QueueExplorer consists of multiple panels, which can be rearranged or temporarily hidden using docking panels.
Server tree (1)
Left part of QueueExplorer’s window displays server and it’s queues. Professional edition can display multiple servers organized in groups.
Messages list (2)
List of messages in a queue. See Working with messages.
Message preview (3)
Displays preview of currently selected message - body, extension (MSMQ), etc.
List of queues belonging to a current node in a tree. For instance if you select “Private queues” this list will display all private queues. See Working with queues.