Hello,
Please add this code in style.css file of your child theme:
@media (min-width: 480px) {
.et-mega-search .et-search-result {
width: 200%;
}
}
To change size of icons you need to edit et_search_get_posts
function from legenda/framework/theme-functions.php in functions.php of your child theme http://prntscr.com/kbmbqd
Regards