How to Hide Smash Balloon Custom Facebook Feed Admin Menus

function plt_hide_custom_facebook_feed_menus() {
	//Hide "Facebook Feed".
	remove_menu_page('cff-top');
	//Hide "Facebook Feed → Setup".
	remove_submenu_page('cff-top', 'cff-setup');
	//Hide "Facebook Feed → All Feeds".
	remove_submenu_page('cff-top', 'cff-feed-builder');
	//Hide "Facebook Feed → Settings".
	remove_submenu_page('cff-top', 'cff-settings');
	//Hide "Facebook Feed → oEmbeds".
	remove_submenu_page('cff-top', 'cff-oembeds-manager');
	//Hide "Facebook Feed → Facebook Feed".
	remove_submenu_page('cff-top', 'cff-top');
	//Hide "Facebook Feed → Support".
	remove_submenu_page('cff-top', 'cff-support');
	//Hide "Facebook Feed → About Us".
	remove_submenu_page('cff-top', 'cff-about-us');
	//Hide "Facebook Feed → Upgrade to Pro".
	remove_submenu_page('cff-top', 'https://smashballoon.com/custom-facebook-feed/?utm_campaign=facebook-free&utm_source=menu-link&utm_medium=upgrade-link&utm_content=UpgradeToPro');
	//Hide "Facebook Feed → Reviews FeedNew!".
	remove_submenu_page('cff-top', 'admin.php?page=sbr');
	//Hide "Facebook Feed → Instagram Feed".
	remove_submenu_page('cff-top', 'admin.php?page=cff-top&tab=more');
	//Hide "Facebook Feed → Twitter Feed".
	remove_submenu_page('cff-top', 'admin.php?page=cff-top&tab=more');
	//Hide "Facebook Feed → YouTube Feed".
	remove_submenu_page('cff-top', 'admin.php?page=cff-top&tab=more');
}

add_action('admin_menu', 'plt_hide_custom_facebook_feed_menus', 11);
Where do I put this code?