newsupernova/vendor/magento/module-backend/view/adminhtml/templates/dashboard/graph.phtml

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

// @codingStandardsIgnoreFile

?>
<div class="dashboard-diagram">
    <div class="dashboard-diagram-switcher">
        <label for="order_<?= $block->getHtmlId() ?>_period"
               class="label"><?= /* @escapeNotVerified */ __('Select Range:') ?></label>
        <select name="period" id="order_<?= $block->getHtmlId() ?>_period"
                onchange="changeDiagramsPeriod(this);" class="admin__control-select">
            <?php foreach ($this->helper('Magento\Backend\Helper\Dashboard\Data')->getDatePeriods() as $value => $label): ?>
                <?php if (in_array($value, ['custom'])) {
                    continue;
                } ?>
                <option value="<?= /* @escapeNotVerified */ $value ?>"
                    <?php if ($block->getRequest()->getParam('period') == $value): ?> selected="selected"<?php endif; ?>
                    ><?= /* @escapeNotVerified */ $label ?></option>
            <?php endforeach; ?>
        </select>
    </div>
    <?php if ($block->getCount()): ?>
    <div class="dashboard-diagram-image">
        <img src="<?= /* @escapeNotVerified */ $block->getChartUrl(false) ?>" class="dashboard-diagram-chart" alt="Chart" title="Chart" />
    </div>
    <?php else: ?>
    <div class="dashboard-diagram-nodata">
        <span><?= /* @escapeNotVerified */ __('No Data Found') ?></span>
    </div>
    <?php endif; ?>
</div>