To make thumbnails overlap image in a gallery slideshow, you can do these.
#1. First, find the Slideshow ID, use below tool.
In my example, we will have:
section[data-section-id="66b387fcef19ee1c529fd9dd"]
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#2. Use this code to Custom CSS box
section[data-section-id="66b387fcef19ee1c529fd9dd"] .gallery-slideshow-thumbnails {
position: absolute;
bottom: 50px;
right: 0;
}
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#3. Result.
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