The default size of the initial xman window is small so that you can leave it running throughout your login session.
In the initial window there are three options: Help will pop up a window with on-line help, Quit will exit, and Manual Page will pop up a window with a manual page browser in it.
Typing Control-S will pop up a window prompting for a specific manual page to display.
You may display more than one manual page browser window at a time from a single execution of xman.