app/code/Magento/Sales/view/adminhtml/layout/sales_order_creditmemo_new.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <update handle="sales_order_item_price"/>
    <body>
        <referenceContainer name="admin.scope.col.wrap" htmlClass="admin__old" /> <!-- ToDo UI: remove this wrapper with old styles removal. The class name "admin__old" is for tests only, we shouldn't use it in any way -->

        <referenceContainer name="content">
            <block class="Magento\Sales\Block\Adminhtml\Order\Creditmemo\Create" name="sales_creditmemo_create">
                <block class="Magento\Sales\Block\Adminhtml\Order\Creditmemo\Create\Form" name="form" template="Magento_Sales::order/creditmemo/create/form.phtml">
                    <block class="Magento\Sales\Block\Adminhtml\Order\View\Info" name="order_info" template="Magento_Sales::order/view/info.phtml">
                        <container name="extra_customer_info"/>
                    </block>
                    <block class="Magento\Sales\Block\Adminhtml\Order\Payment" name="order_payment"/>
                    <block class="Magento\Sales\Block\Adminhtml\Order\Creditmemo\Create\Items" name="order_items" template="Magento_Sales::order/creditmemo/create/items.phtml">
                        <arguments>
                            <argument name="viewModel" xsi:type="object">Magento\Sales\ViewModel\CreditMemo\Create\UpdateTotalsButton</argument>
                            <argument name="itemsToRenderViewModel" xsi:type="object">Magento\Sales\ViewModel\CreditMemo\Create\ItemsToRender</argument>
                        </arguments>
                        <block class="Magento\Sales\Block\Adminhtml\Items\Renderer\DefaultRenderer" name="order_items.default" as="default" template="Magento_Sales::order/creditmemo/create/items/renderer/default.phtml"/>
                        <block class="Magento\Sales\Block\Adminhtml\Items\Column\Qty" name="column_qty" template="Magento_Sales::items/column/qty.phtml" group="column"/>
                        <block class="Magento\Sales\Block\Adminhtml\Items\Column\Name" name="column_name" template="Magento_Sales::items/column/name.phtml" group="column"/>
                        <block class="Magento\Framework\View\Element\Text\ListText" name="order_item_extra_info"/>
                        <block class="Magento\Sales\Block\Adminhtml\Order\Creditmemo\Totals" name="creditmemo_totals" template="Magento_Sales::order/totals.phtml">
                            <block class="Magento\Sales\Block\Adminhtml\Order\Creditmemo\Create\Adjustments" name="adjustments" template="Magento_Sales::order/creditmemo/create/totals/adjustments.phtml"/>
                            <block class="Magento\Sales\Block\Adminhtml\Order\Totals\Tax" name="tax" template="Magento_Sales::order/totals/tax.phtml"/>
                        </block>
                        <container name="submit_before" label="Submit Before"/>
                        <container name="submit_after" label="Submit After"/>
                    </block>
                </block>
            </block>
        </referenceContainer>
    </body>
</page>