Scroll bar is a feature or property of any chart where information couldn't appear in existing pane. It comes when any chart doesn't has enough space to populate each value on axis , horizontal or vertical. So if you have to remove scroll bar,expand the chart as much all the X-axis value will be displayed. if lest one value will be hidden scroll bar will come.
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Okay, so I guess using add-ons it the way to go in that case.
I just found that one for example, which looks promising: http://branch.qlik.com/?&_ga=2.9414901.1706559652.1495210017-599664405.1489136015#!/project/56728f52d1e497241ae6987f