Hide some information from Delivery Notes

there is a wonderful question in the faq that will help you: https://ww.wp.xz.cn/plugins/woocommerce-delivery-notes/faq/

Can I hide the prices on the delivery note?
Sure, the easiest way is to hide them with some CSS that is hooked in with wcdn_head.

An example that hides the whole price column and the totals. Paste the code in the functions.php file of your theme:

function example_price_free_delivery_note() {
    ?>
        <style>
            .delivery-note .head-item-price,
            .delivery-note .head-price,
            .delivery-note .product-item-price,
            .delivery-note .product-price,
            .delivery-note .order-items tfoot {
                display: none;
            }
            .delivery-note .head-name,
            .delivery-note .product-name {
                width: 50%;
            }
            .delivery-note .head-quantity,
            .delivery-note .product-quantity {
                width: 50%;
            }
            .delivery-note .order-items tbody tr:last-child {
                border-bottom: 0.24em solid black;
            }
        </style>
    <?php
}
add_action( 'wcdn_head', 'example_price_free_delivery_note', 20 );