How to Hide AdFoxly - Ad Manager, AdSense Ads & Ads.txt Admin Menus

function plt_hide_adfoxly_menus() {
	//Hide "AdFoxly".
	remove_menu_page('adfoxly');
	//Hide "AdFoxly → AdFoxly".
	remove_submenu_page('adfoxly', 'adfoxly');
	//Hide "AdFoxly → New Ad - Wizard".
	remove_submenu_page('adfoxly', 'adfoxly-new');
	//Hide "AdFoxly → Ads - What".
	remove_submenu_page('adfoxly', 'adfoxly-banners');
	//Hide "AdFoxly → Places - Where".
	remove_submenu_page('adfoxly', 'adfoxly-places');
	//Hide "AdFoxly → Campaigns - When".
	remove_submenu_page('adfoxly', 'adfoxly-campaigns');
	//Hide "AdFoxly → Analytics (beta)".
	remove_submenu_page('adfoxly', 'adfoxly-analytics');
	//Hide "AdFoxly → Settings".
	remove_submenu_page('adfoxly', 'adfoxly-settings');
	//Hide "AdFoxly → Contact Us".
	remove_submenu_page('adfoxly', 'adfoxly-contact');
	//Hide "AdFoxly → Upgrade".
	remove_submenu_page('adfoxly', 'adfoxly-pricing');
}

add_action('admin_menu', 'plt_hide_adfoxly_menus', 1000000000);
Where do I put this code?