How to Change WordPress Sub-Menu Class with Custom Class
we can use wordpress filter for change ‘sub-menu’ class. place below code in functions.php for replace ‘sub-menu’ class
function replace_submenu_class($menu) {
$menu = preg_replace('/ class="sub-menu"/','/ class="yourclassname" /',$menu);
return $menu;
}
add_filter('wp_nav_menu','replace_submenu_class');