Library /sys$common/syshlp/dtm$dw_helplib.hlb overview, views, clos_vu  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  To close the active view window when more than one view
  window is open (without exiting Digital Test Manager),
  pull down the View menu and choose the Close View menu
  item.

  The Close View menu item is accessible from both the
  Library and View menus. It is inactive if only one
  window is open.