tree.phtml

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

// @codingStandardsIgnoreFile

 /** @var \Magento\Cms\Block\Adminhtml\Wysiwyg\Images\Tree $block */
?>
<div class="tree-panel" >
    <div class="categories-side-col">
        <div class="tree-actions">
            <a onclick="jQuery('[data-role=tree]').jstree('close_all');"><?= $block->escapeHtml(__('Collapse All')) ?></a>
            <span class="separator">|</span>
            <a onclick="jQuery('[data-role=tree]').jstree('open_all');"><?= $block->escapeHtml(__('Expand All')) ?></a>
        </div>
    </div>
    <div data-role="tree" data-mage-init='<?= $block->escapeHtml($this->helper('Magento\Framework\Json\Helper\Data')->jsonEncode($block->getTreeWidgetOptions())) ?>'>
    </div>
</div>