How to Hide WOOCS - WooCommerce Currency Switcher Meta Boxes

function plt_hide_woocommerce_currency_switcher_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "WOOCS Order Info" meta box.
	remove_meta_box('woocs_order_metabox', $screen->id, 'side');
	//Hide the "WOOCS Order Info" meta box.
	remove_meta_box('woocs_order_metabox_wcs', $screen->id, 'side');
}

add_action('add_meta_boxes', 'plt_hide_woocommerce_currency_switcher_metaboxes', 20);

Where do I put this code?