How to Hide the "Daisycon WooCommerce pixel" Admin Menu

function plt_hide_daisycon_woocommerce_pixel_menus() {
	//Hide the "Settings → Daisycon WooCommerce pixel" menu.
	remove_submenu_page('options-general.php', 'daisycon-woocommerce');
}

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

Where do I put this code?