magento-test/app/code/Magento/Cms/Test/Mftf/ActionGroup/SetLayoutActionGroup.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="SetLayoutActionGroup">
        <annotations>
            <description>Sets the provided option for 'Layout', under 'Design' on the Page creation/edit page. </description>
        </annotations>
        <arguments>
            <argument name="designSection"/>
            <argument name="layoutOption"/>
        </arguments>

        <waitForElementVisible selector="{{designSection.DesignTab}}" stepKey="waitForDesignTabVisible"/>
        <conditionalClick selector="{{designSection.DesignTab}}" dependentSelector="{{designSection.LayoutDropdown}}" visible="false" stepKey="clickOnDesignTab"/>
        <waitForPageLoad stepKey="waitForPageLoadDesignTab"/>
        <waitForElementVisible selector="{{designSection.LayoutDropdown}}" stepKey="waitForLayoutDropDown"/>
        <selectOption selector="{{designSection.LayoutDropdown}}" userInput="{{layoutOption}}" stepKey="selectLayout"/>
    </actionGroup>
</actionGroups>