Beaver Builder - Add Search to Mobile

bb-search.php

<?php 
/**
 * Add Search Box to Mobile
 * Adds a search box to mobile, below the header.
 * To move it above the header, change fl_after_header to fl_before_header
 */
function bbMenuPolish_addMobileSearch(){
    if ( wp_is_mobile() ) {
        get_search_form();
    }
}
add_action( 'fl_after_header', 'bbMenuPolish_addMobileSearch' );