Before you use this plugin you need to enable element detection by ID in Settings > General and Check "Expose the option to add an ID attribute to HTML elements".
How to use:
1) Insert the visual element "Scroll" OUTSIDE the group you need the scrolling. This element must be visible.
2) The group you need the scrolling insert the ID attribute. This ID MUST NOT contains space. This group can't have minimum neither maximum width. Make sure the fit with content is UNCHECKED as well.
3) Insert the same ID attribute to the visual element "Scroll".
4) You MUST insert another group inside the group on step 2 with minimum width. Set maximum width as "inf" and make sure to UNCHECK fit width with content.
DEMO & DOCUMENTATION
https://erick-personal-portfolio.bubbleapps.io/version-test/horizontal_scrollEDITOR
https://bubble.io/page?type=page&name=horizontal_scroll&id=erick-personal-portfolio&tab=tabs-1