If you are getting a "mixed content" warning (you have some http:// URLs in the database), please make sure to update all URLs in the database, either using wp-cli or this plugin https://wordpress.org/plugins/better-search-replace/.
Then, go to Elementor > Tools > General and click the "Regenerate Files & Data" button:
You can also check this article How to fix mixed content in Elementor after moving to SSL