Please overwrite the below file and update the code.
vendor/magento/module-sales/view/adminhtml/templates/order/creditmemo/create/items/renderer/default.phtml
<?php /** * Copyright © Magento, Inc. All rights reserved. * See COPYING.txt for license details. */ ?> <?php /** @var $block \Magento\Sales\Block\Adminhtml\Items\Renderer\DefaultRenderer */ ?> <?php $_item = $block->getItem() ?> <?php $block->setPriceDataObject($_item); ?> <?php $om = \Magento\Framework\App\ObjectManager::getInstance(); /** @var \Magento\Framework\App\RequestInterface|\Magento\Framework\App\Request\Http $request */ $request = $om->get('Magento\Framework\App\RequestInterface'); $request->isXmlHttpRequest(); if (!$request->isXmlHttpRequest()) { $_item->setQty(0); } ?> <tr> <td class="col-product"><?= $block->getColumnHtml($_item, 'name') ?></td> <td class="col-price"> <?= $block->getColumnHtml($_item, 'price') ?> </td> <td class="col-ordered-qty"><?= $block->getColumnHtml($_item, 'qty') ?></td> <?php if ($block->canParentReturnToStock($_item)) : ?> <td class="col-return-to-stock"> <?php if ($block->canReturnItemToStock($_item)) : ?> <input type="checkbox" class="admin__control-checkbox" name="creditmemo[items][<?= (int) $_item->getOrderItemId() ?>][back_to_stock]" value="1"<?php if ($_item->getBackToStock()) : ?> checked<?php endif; ?>/> <label class="admin__field-label"></label> <?php endif; ?> </td> <?php endif; ?> <td class="col-refund col-qty"> <?php if ($block->canEditQty()) : ?> <input type="text" class="input-text admin__control-text qty-input" name="creditmemo[items][<?= (int) $_item->getOrderItemId() ?>][qty]" value="<?= (float) $_item->getQty() ?>"/> <?php else : ?> <?= (float) $_item->getQty() ?> <?php endif; ?> </td> <td class="col-subtotal"> <?= $block->getColumnHtml($_item, 'subtotal') ?> </td> <td class="col-tax-amount"><?= /* @noEscape */ $block->displayPriceAttribute('tax_amount') ?></td> <td class="col-discont"><?= /* @noEscape */ $block->displayPriceAttribute('discount_amount') ?></td> <td class="col-total last"> <?= $block->getColumnHtml($_item, 'total') ?> </td> </tr>