How to Hide WordPress Simple HTML Sitemap Admin Menus

function plt_hide_wp_simple_html_sitemap_menus() {
	//Hide "WordPress Simple HTML Sitemap".
	remove_menu_page('wshs_page_list');
	//Hide "WordPress Simple HTML Sitemap → Pages".
	remove_submenu_page('wshs_page_list', 'wshs_page_list');
	//Hide "WordPress Simple HTML Sitemap → Posts".
	remove_submenu_page('wshs_page_list', 'wshs_post_list');
	//Hide "WordPress Simple HTML Sitemap → Saved Shortcodes".
	remove_submenu_page('wshs_page_list', 'wshs_saved');
	//Hide "WordPress Simple HTML Sitemap → Documentation".
	remove_submenu_page('wshs_page_list', 'wshs_documentation');
}

add_action('admin_menu', 'plt_hide_wp_simple_html_sitemap_menus', 11);

Where do I put this code?