If you see a horizontal scrollbar on your website, this is most likely caused by an element that is placed too far to the right on your website. You can easily check this:

Open your Website Builder and go for Preview. If you see a horizontal scroll bar, scroll right to the end. You will most likely find an element there that is outside the content boundaries. Note that this element may also be completely white and therefore difficult to see. Position the element correctly within the content boundaries or delete it if you do not need it.

Once you have deleted or repositioned all elements outside the content boundaries, the horizontal scrollbar will disappear. You can then publish your website.