view/adminhtml/layout/mundipagg_mundipagg_plans_index.xml
<?xml version="1.0" ?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<update handle="styles"/>
<body>
<referenceContainer name="content">
<uiComponent name="mundipagg_mundipagg_plans_listing"/>
</referenceContainer>
</body>
</page>