button.phtml

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

// @codingStandardsIgnoreFile

?>
<?php /** @var $block \Magento\Checkout\Block\Onepage\Success */ ?>

<?php if ($block->getCanViewOrder() && $block->getCanPrintOrder()) :?>
    <a href="<?= /* @escapeNotVerified */ $block->getPrintUrl() ?>" target="_blank" class="print">
        <?= /* @escapeNotVerified */ __('Print receipt') ?>
    </a>
    <?= $block->getChildHtml() ?>
<?php endif;?>