Hello,
Actually, the issue has raised due to incompatibility of the theme you have used with the plugin. However, you can add following given CSS code to resolve the layout issue.
.wp-tour-extras-detail-slider-wrap .wp-tour-extras-detail-slider .slick-track{
width: 820px;
}
.wp-tour-extras-detail-slider-wrap .wp-tour-extras-detail-slider-nav .slick-track{
width: auto;
}
Also, when we inspected the site URL you have provided, we have found that inline css has been used for the section where layout issue is appearing. So, you have to replace the inline CSS code with the above given CSS code as the added code in Additional section will not work due to presence of inline CSS.
If you have any queries further, let us know.
Thank you.