Van "automatically configure" means that we have a script that runs after you edit your site configuration at https://my.opalstack.com/domains/. If you have the option enabled, then the script will run and update your WP
siteurl options database to set the WP domain to your site domain.
It does not update URLs for your media and other content, and it doesn't do anything related to your DNS.
If your site domain isn't working correctly then you can run the following commands as your app's shell user to try to correct it:
# change name_of_app to your app name
# change domain.com to your site domain or subdomain
wp option set home https://domain.com
wp option set siteurl https://domain.com
If you've set the site domain correctly and your content still appears to be broken then use your browser's dev tools to see exactly what URLs the broken items are using. That should give you some idea of how to proceed with troubleshooting.