Horizontal scroll cannot be achieved with a scroll container.
This widget is used to specify regions in your page with different scroll behavior when content overflows the length of the region(s).
Horizontal scroll can be achieved using custom CSS. Something like this
class: lv-col-0
width: 2000px; (width size to be defined according to your own spec)
overflow-x:scroll;
Not perfect yet, but have to leave you some work yourself ;-)