magento-test/app/code/Magento/GraphQl/etc/config.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Store:etc/config.xsd">
    <default>
        <web_api>
            <graphql>
                <include_dynamic_attributes_as_entity_type_fields>1</include_dynamic_attributes_as_entity_type_fields>
            </graphql>
        </web_api>
        <graphql>
            <session>
                <disable>0</disable>
            </session>
        </graphql>
    </default>
</config>