How to Hide Publish To Apple News Admin Menus

function plt_hide_publish_to_apple_news_menus() {
	//Hide "Apple News".
	remove_menu_page('apple_news_index');
	//Hide "Apple News → Articles".
	remove_submenu_page('apple_news_index', 'apple_news_index');
	//Hide "Apple News → Settings".
	remove_submenu_page('apple_news_index', 'apple-news-options');
	//Hide "Apple News → Automation".
	remove_submenu_page('apple_news_index', 'apple-news-automation');
}

add_action('admin_menu', 'plt_hide_publish_to_apple_news_menus', 101);

Where do I put this code?