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

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../Magento/Backend/etc/menu.xsd">
    <menu>
        <add id="Smartwave_Core::sw_all" title="Porto" module="Smartwave_Core" sortOrder="60" resource="Smartwave_Core::all"/>
    </menu>
</config>