How to Hide The Cache Purger Admin Menus

function plt_hide_the_cache_purger_menus() {
	//Hide "Tools → Scheduled Actions".
	remove_submenu_page('tools.php', 'action-scheduler');

	//Hide "The Cache Purge".
	remove_menu_page('kpcp_settings');
	//Hide "The Cache Purge → Settings".
	remove_submenu_page('kpcp_settings', 'kpcp_settings#tab=settings');
	//Hide "The Cache Purge → API/Server Settings".
	remove_submenu_page('kpcp_settings', 'kpcp_settings#tab=api-server-settings');
	//Hide "The Cache Purge → CRON Action Settings".
	remove_submenu_page('kpcp_settings', 'kpcp_settings#tab=cron-action-settings');
	//Hide "The Cache Purge → Documentation".
	remove_submenu_page('kpcp_settings', 'kpcp_settings#tab=documentation');
	//Hide "The Cache Purge → Export/Import Settings".
	remove_submenu_page('kpcp_settings', 'kpcp_settings#tab=export-import-settings');
}

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

Where do I put this code?