newsupernova/app/code/Mageplaza/Core/etc/adminhtml/menu.xml

<?xml version="1.0"?>
<!--
/**
 * Mageplaza
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Mageplaza.com license that is
 * available through the world-wide-web at this URL:
 * https://www.mageplaza.com/LICENSE.txt
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade this extension to newer
 * version in the future.
 *
 * @category    Mageplaza
 * @package     Mageplaza_Core
 * @copyright   Copyright (c) 2016-2018 Mageplaza (http://www.mageplaza.com/)
 * @license     https://www.mageplaza.com/LICENSE.txt
 */
 -->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Backend:etc/menu.xsd">
    <menu>
        <add id="Mageplaza_Core::menu" title="Mageplaza" module="Mageplaza_Core" sortOrder="50" resource="Mageplaza_Core::menu"/>
        <add id="Mageplaza_Core::documentation" title="Documentations" module="Mageplaza_Core" sortOrder="999" resource="Mageplaza_Core::documentation" parent="Mageplaza_Core::menu"/>
        <add id="Mageplaza_Core::marketplace" title="Mageplaza Marketplace" module="Mageplaza_Core" sortOrder="10" action="adminhtml/system_config/edit/section/mpmarketplace" resource="Mageplaza_Core::marketplace" parent="Mageplaza_Core::documentation"/>
        <add id="Mageplaza_Core::userguide" title="User Guides" module="Mageplaza_Core" sortOrder="20" action="mageplaza_core/index/userguide" resource="Mageplaza_Core::userguide" parent="Mageplaza_Core::documentation"/>
    </menu>
</config>