newsupernova/vendor/magento/module-customer/view/adminhtml/templates/tab/newsletter.phtml

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

// @codingStandardsIgnoreFile

?>
<div class="entry-edit">
<?= $block->getForm()->getHtml() ?>
</div>
<?= $block->getChildHtml('grid') ?>