function plt_hide_master_slider_menus() {
//Hide the "Master Slider" menu.
remove_menu_page('master-slider');
//Hide the "Master Slider → Master Slider" menu.
remove_submenu_page('master-slider', 'master-slider');
//Hide the "Master Slider → Settings" menu.
remove_submenu_page('master-slider', 'master-slider-setting');
}
add_action('admin_menu', 'plt_hide_master_slider_menus', 12);