Oh, I see. I thought you talked about sticky filter button that will follow you on scroll.
If you want just to get the Filters button as on our demo go to Appearance > Widgets > add the necessary widgets to Shop filters area http://prntscr.com/p770fg
To disable sidebar go to Theme Options > WooCommerce > Shop > Shop page layout http://prntscr.com/p771w6
To open/close filters area by default use option http://prntscr.com/p7731f
