#1. First, you need to enable Gallery Slideshow Arrows
#2. Next, use this code to Code Injection – Footer or Page Header Code Injection
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script> <script> jQuery(document).ready(function($) { function run() { if ($(window).width() < 991) { setInterval(function(){ $('.gallery-slideshow-control-btn[data-next], .gallery-fullscreen-slideshow-control-btn[data-next]').click() },3000); } } run(); window.addEventListener('resize', run) }); </script>