The fake scrollbar on the documentation page is infuriatingly nonfunctional.
Uh? There is definitely no purposefully fake scrollbar, could you please share a screenshot and/or the device and browser you are using please? Ideally in Github as an issue: https://github.com/franciscop/umbrella/issues/new , but here is fine as well.
So not "scrollbar" but "scrolling" as the result of the click, on the documentation page:
https://umbrellajs.com/documentation
I'm one of those who have the problem with the animations in the UIs too. Believe or not some people get effectively a real sickness feeling just by looking at some specific movements, in my case that page manages to achieve that.