magento-test/app/code/Magento/Sales/Test/Mftf/Section/AdminOrderFormTotalSection.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-->

<sections xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:mftf:Page/etc/SectionObject.xsd">
    <section name="AdminOrderFormTotalSection">
        <element name="subtotalRow" type="text" selector="#order-totals>table tr.row-totals:nth-of-type({{row}}) span.price" parameterized="true"/>
        <element name="total" type="text" selector="//tr[contains(@class,'row-totals')]/td[contains(text(), '{{total}}')]/following-sibling::td/span[contains(@class, 'price')]" parameterized="true"/>
        <element name="grandTotal" type="text" selector="//tr[contains(@class,'row-totals')]/td/strong[contains(text(), 'Grand Total')]/parent::td/following-sibling::td//span[contains(@class, 'price')]"/>
        <element name="appendComments" type="checkbox" selector="input#notify_customer"/>
    </section>
</sections>