Even if you don’t have access to the polls, you can still modify the styling (including the width, font-size, etc.) using CSS.
Otherwise, to use a one-column layout for that page, see this post: https://forum.graphene-theme.com/topic/one-column#post-56
As for the slider, somehow the javascript is loaded, but is not executed. Maybe there’s a conflicting scripts somewhere. Is it possible to deactivate all plugins to see if it works?