How to Hide Custom Post Type UI Admin Menus

function plt_hide_custom_post_type_ui_menus() {
	//Hide "CPT UI".
	remove_menu_page('cptui_main_menu');
	//Hide "CPT UI → Add/Edit Post Types".
	remove_submenu_page('cptui_main_menu', 'cptui_manage_post_types');
	//Hide "CPT UI → Add/Edit Taxonomies".
	remove_submenu_page('cptui_main_menu', 'cptui_manage_taxonomies');
	//Hide "CPT UI → Registered Types/Taxes".
	remove_submenu_page('cptui_main_menu', 'cptui_listings');
	//Hide "CPT UI → Tools".
	remove_submenu_page('cptui_main_menu', 'cptui_tools');
	//Hide "CPT UI → Help/Support".
	remove_submenu_page('cptui_main_menu', 'cptui_support');
	//Hide "CPT UI → About CPT UI".
	remove_submenu_page('cptui_main_menu', 'cptui_main_menu');
}

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

Where do I put this code?