Hi,
Searched around for others that are having the same issue and cannot find anything. On ALL my X Theme sites that have older pages built in WPBakerly, by updating X to 6.3 the page layout breaks.
You can see the result here:
Live site with X 6.2.5 : https://www.troypsychotherapy.com
Staging server with all plugins and latest X installed: http://i6u.ea2.myftpupload.com
since i cannot load all links in one post on this forum, i will reply with more info now.