Hi Micheal,
Thanks for writing in,
The default template of a page in wordpress is page.php located in theme root directory,
In X, the page.php file is pulling the content of x/framework/views/[your-stack]/wp-page.php
If you wish to customize any template files, please don’t forget to set-up a child theme and copy the files you wanted to modify into the child theme structure,
Please refer to this article.
Hope that helps,
Cheers