function plt_hide_post_meta_data_manager_menus() {
//Hide the "PMDM Settings" menu.
remove_menu_page('pmdm-general-settings');
//Hide the "PMDM Settings → PMDM Settings" menu.
remove_submenu_page('pmdm-general-settings', 'pmdm-general-settings');
//Hide the "PMDM Settings → Help" menu.
remove_submenu_page('pmdm-general-settings', 'pmdm-help');
}
add_action('admin_menu', 'plt_hide_post_meta_data_manager_menus', 11);