#1. First, find the ID of the Slideshow.
In my example, we will have:
section[data-section-id="66b558355d5793599c7f117c"]
#2. Use this code to Custom CSS box
@media screen and (min-width:768px) { section[data-section-id="66b558355d5793599c7f117c"] { .gallery-slideshow[data-thumbnails="true"] { display: flex; flex-direction: row-reverse; align-items: center; } .gallery-slideshow-thumbnails { width: 30% !important; }}}