Order actions hidden in WC 3.3+

Among the order actions I have a button that allows me to generate a PDF invoice. But in WooCommerce 3.3+ the order actions are hidden:

<td class="wc_actions column-wc_actions hidden" data-colname="Actions">...</td>

That’s because in the file class-wc-admin-list-table-orders.php the wc_actions are included among the hidden colums:

protected function define_hidden_columns() {
	return array(
		'shipping_address',
		'billing_address',
		'wc_actions',
	);
}

How can I make them appear again as in previous versions?

Thanks!