Thanks, I am using the default template from getbootstrap.com and it comes with the above line. Regret not adding that here. I still get this horizontal bar extension.
It’s the class vw-100, use w-100 instead. The latter means a width of 100%, the former is the full window width plus the vertical scrollbar at the right side of the window. That adds about 15 - 20px to the page’s width (I think on Chrome it’s 17).
On pages that are “short” (have less height than 100vh), so you have no vertical scrollbar, 100vw and 100% are the same, and your horizontal scrollbar disappears.