Get list of Layout XML called for a current page Magento 2.

You can get a list of called Layout XML for specific pages by Magento\Framework\App\View class.

Call getLayout() method from Magento\Framework\App\View.php class.

getLayout()->getUpdate()->getHandles() used for getting all the handles of a page.

You need to keep below code at the end of root index.php file to check the available layout XML files for a page.