I think I have the same problem. I have two websites (both running WP 5.4 and Flat Responsive Pro 4.5.0). Both have a Smart Slider Widget in the Banner Wide Widget Area.
On both sites the banner/slider is visible on the home page. On one of the websites the banner/slider is also visible on all other pages. But on the other website the banner/slider is not visible on the other pages.
I have checked al settings, but can’t find any difference.