Library /sys$common/syshlp/pca$help.hlb EXPAND, Qualifiers, /LEFT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /LEFT[:n]

    Moves the left border of the display to the left by n lines (if n
    is positive) or to the right by n lines (if n is negative). If n
    is omitted, the border is moved to the left by one line.