Slide toggle Jquery UI

As jQuery UI is included in the WordPress Core, you don’t need to load it from the CDN. Please try to change your wp_enqueue_scripts from

wp_enqueue_script('jquery-ui', 'http://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js', '1', true);
wp_enqueue_script('menu_script', get_stylesheet_directory_uri() . '/js/menu.js', array('jquery', 'jquery-ui'), '1', true);

to 

wp_enqueue_script('jquery-ui-core');
wp_enqueue_script('jquery-effects-slide');
wp_enqueue_script('menu_script', get_stylesheet_directory_uri() . '/js/menu.js', array('jquery', 'jquery-ui-core','jquery-effects-slide'), '1', true);

Also be sure to call for the Slide Effect within a document.ready function 😉

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