You can resize the Help window by moving the pointer to
  any window border or to any corner.

  -  To change only the vertical or the horizontal
     dimension, move the pointer to the appropriate
     border.

  -  To change both dimensions, move the pointer to a
     corner from which you want to enlarge or shrink the
     window.

  The pointer changes its shape to indicate the direction
  or directions in which you will be moving the window
  border or borders.

  To move the border or borders, press and hold MB1 on
  the border or corner, then move the pointer to the
  desired new location of the window borders. (You will
  see a "ghost" outline change as you move the pointer.)
  When the outline reaches the desired new window size,
  release MB1.