If you see a horizontal scroll bar on your website, it is most likely caused by elements on the website that are placed too far to the right of the site content. You can easily check this. Go to the website editor and check if all pages have a horizontal scroll bar in the editor. If they do, scroll all the way to the end and you'll probably find an element there (note that it may be absolutely white, such as a small white shape, so it can sometimes be difficult to detect). Place the element appropriately within the content boundaries or remove it if it is not needed. If this element is only needed in one version (Wide, Desktop, Tablet, Phone), you can right-click on it and choose to hide it in the context menu.
When such elements are no longer left on the page in the editor, the horizontal scroll bar should disappear. After that, publish your website.