selector.phtml

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

// @codingStandardsIgnoreFile

/** @var \Magento\UrlRewrite\Block\Selector $block */
?>
<div class="form-inline">
    <fieldset class="admin__fieldset fieldset" data-container-for="entity-type-selector">
        <div class="admin__field field field-entity-type-selector">
            <label for="entity-type-selector" class="admin__field-label label">
                <span><?= $block->escapeHtml($block->getSelectorLabel()) ?></span>
            </label>
            <div class="admin__field-control control">
                <select data-role="entity-type-selector" class="admin__control-select select" onchange="window.location = this.value;" id="entity-type-selector">
                <?php foreach ($block->getModes() as $mode => $label): ?>
                    <option <?php /* noEscape */ echo $block->isMode($mode) ? 'selected="selected" ' : '' ?>value="<?= $block->escapeUrl($block->getModeUrl($mode)) ?>"><?= $block->escapeHtml($label) ?></option>
                <?php endforeach; ?>
                </select>
            </div>
        </div>
    </fieldset>
</div>