Hi @Guillaumeg06,
Thank you for the information. I checked the website and here is the problem that causes the error message of the page builder:

Access to XMLHttpRequest at ‘https://it.yachting-insurance.com/a-proposito/’ (redirected from ‘https://www.yachting-insurance.com/a-proposito/’) from origin ‘https://www.yachting-insurance.com’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.
Let me give you context:
The Page Builder preview area uses iFrame to fetch the website and show a preview. Now, the problem is that when you go to edit for example Italian, your website main domain is https://it.yachting-insurance.com
, but the Page Builder tries to load the preview which WordPress tells it, and that is https://www.yachting-insurance.com
. It causes the server to block the iFrame as server thinks the IT domain wants to access something from WWW domain and considers it a foreign one and throws the security blocking called CORS policy
.
Please contact your hosting service provider and ask them to make all the domains and subdomains go around the CORs policy.
But even if that is fixed, the page builder will show the English version as the WordPress tell it the domain is that. So you need to avoid using the Preview for the other languages anyway.
Instead please ignore the error message and click the Skeleton mode icon at the left side of the builder:

That will minimize the preview window and show the Skeleton mode. You can select the elements and change whatever you normally want without having the preview itself:

Saving the changes will show in the front end of the website.
So the bottom line is that you will lose the preview section of the builder for the other languages, but you still can use the Skeleton mode to do your changes.
Thank you.