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You can add below code in you javascript file: /themes/alexa/assets/js/custom.js

$(document).on('click', '.scroll-box-arrows .material-icons', function(e) {
    if ($(window).width() < 768) {
        setTimeout(function() {
            var imgSrc = $('.product-images li:first-child img').attr('data-image-large-src');
            $('img.js-qv-product-cover').attr('src', imgSrc);
        }, 700);
    }
});

This will change large images also.