Change the free order status to on hold by default in WooCommerce on child sites.
Snippet Type
Execute on Child Sites
Snippet
function change_free_order_status( $order_id ) {
if ( ! $order_id ) {return;}
$order = wc_get_order( $order_id );
if($order->get_total() <= 0):
$order->update_status( 'on-hold' ); // Change to what you need
endif;
}
add_action('woocommerce_thankyou','change_free_order_status');