newsupernova/vendor/magento/module-sales/view/adminhtml/templates/items/renderer/default.phtml

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

// @codingStandardsIgnoreFile

?>

<?= /* @escapeNotVerified */ $block->getItem()->getName() ?>
<div><strong><?= /* @escapeNotVerified */ __('SKU') ?>:</strong> <?= implode('<br />', $this->helper('Magento\Catalog\Helper\Data')->splitSku($block->escapeHtml($block->getItem()->getSku()))) ?></div>
<?php if ($block->getOrderOptions()): ?>
    <ul class="item-options">
    <?php foreach ($block->getOrderOptions() as $option): ?>
        <li><strong><?= /* @escapeNotVerified */ $option['label'] ?>:</strong><br />
        <?php if (is_array($option['value'])): ?>
        <?php foreach ($option['value'] as $item): ?>
            <?= $block->getValueHtml($item) ?><br />
            <?php endforeach; ?>
        <?php else: ?>
            <?= $block->escapeHtml($option['value']) ?>
        <?php endif; ?>
        </li>
    <?php endforeach; ?>
    </ul>
<?php endif; ?>
<?= $block->escapeHtml($block->getItem()->getDescription()) ?>