To change the length and width of a line, or to change the shape and size of the line’s head and tail:
In Page view, select the line.
Selection handles appear.
Place the pointer over a selection handle. The pointer changes to a crosshair.
To make the line longer or shorter, or to change its direction, drag an end handle.
To make the line thicker or thinner, drag a side handle.
To change the shape of the head or tail, drag one of its handles.
In the Style section of the Line Properties palette, select a style from the Head or Tail drop-down lists to change the head or tail style.