function plt_hide_vertical_marquee_post_title_menus() {
//Hide the "Settings → Vertical marquee post title" menu.
remove_submenu_page('options-general.php', 'vertical-marquee-post-title/vertical-marquee-post-title.php');
}
add_action('admin_menu', 'plt_hide_vertical_marquee_post_title_menus', 11);