Most elements on the lines palette span a range from a start element to an end element.\n To edit its range, double-click the line (which automatically selects its end handle) and:\n - Press "Shift+Right" to move that handle forward.\n - Press "Shift+Left" to move that handle backward. Alternatively, first selecting a range of elements in the score and then double-clicking a line element in the palette will add that new element across the selected range.