Library /sys$common/syshlp/lse$menu.hlb SET_MINIMUM_WINDOW_LENGTH  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Syntax:  SET MINIMUM WINDOW LENGTH number

  Specifies the minimum length of the windows that LSE automatically
  creates.

  This command specifies a lower bound on the size of the windows that
  LSE automatically creates.  When you map a window to a buffer, LSE
  creates a new window if the window is not shorter than the parameter
  value n.  LSE uses the this command and the SET MAXIMUM WINDOWS
  setting to determine whether to add a window to the screen or to
  reuse an existing window.  LSE checks both settings and creates a new
  window only if both conditions are met.