magento-test/app/code/Magento/Sales/Test/Mftf/ActionGroup/AdminOpenCreditMemoFromOrderPageActionGroup.xml

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

<actionGroups xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/actionGroupSchema.xsd">
    <actionGroup name="AdminOpenCreditMemoFromOrderPageActionGroup">
        <annotations>
            <description>Admin open creditmemo from order</description>
        </annotations>
        <conditionalClick selector="{{AdminOrderDetailsOrderViewSection.creditMemos}}" dependentSelector="{{AdminOrderCreditMemosTabSection.viewGridRow('1')}}" visible="false" stepKey="openCreditMemosTab"/>
        <waitForElementVisible selector="{{AdminCreditMemoTotalSection.viewMemo}}" stepKey="waitForCreditMemosTabOpened"/>
        <click selector="{{AdminOrderCreditMemosTabSection.viewGridRow('1')}}" stepKey="viewMemo"/>
        <waitForPageLoad stepKey="waitForCreditMemoOpened"/>
    </actionGroup>
</actionGroups>