Hello,
The drag & drop builder we have in Customizer and Elementor use different page structures and different code markup so if you edit a page with both builders they will break each other’s structure and they won’t work properly anymore.
This is a valid issue with any two builders, not just with ours and Elementor. For example if you install both Elementor and Beaver Builder or Visual Composer you won’t be able to edit a page with both builders.
This is normal behaviour – it would be impossible for our builder to be able to understand the code from any other builder out there.
You can still use Elementor or other builders but you have to edit a page only with the builder that created it. So if you create a page in the Customizer, edit it only in the Customizer. And if you create a page with Elementor, edit it only with Elementor. Cross-editing between the builders will break your pages.
If you break the page code you can try to use the revision feature in your WordPress Admin to rollback to a previous version of a your page.
To do that you need to go to WP Admin -> Pages -> YourPage ->Revisions.
Please see https://cristian-extendstudio.tinytake.com/tt/MzUwMTExM18xMDUwOTk4OQ
