function plt_hide_smart_slider_3_menus() {
//Hide "Smart Slider".
remove_menu_page('smart-slider3');
//Hide "Smart Slider → Dashboard".
remove_submenu_page('smart-slider3', 'smart-slider3');
//Hide "Smart Slider → Help center".
remove_submenu_page('smart-slider3', 'smart-slider3-help');
//Hide "Smart Slider → Go Pro".
remove_submenu_page('smart-slider3', 'smart-slider3-go-pro');
}
add_action('admin_menu', 'plt_hide_smart_slider_3_menus', 11);