Hello Dorian,
As an initial troubleshooting step, please try to regenerate the CSS files via Elementor > Tools > Regenerate CSS on your WordPress Dashboard to see if it helps.
Also, please make sure that you clear all forms of cache including your browser cache, your WP cache (your WP caching plugin if you have one), and your server cache (In this case, you can contact your hosting provider for help to clear the server cache).
Ref:Caching Prevents Live Site From Showing Changes In Editor
The issue can be also related to an incompatibility, to rule out the possibility of a plugin or theme conflict, please deactivate all your plugins (besides Elementor and Elementor Pro) to see if it helps. If it solves the issue, then reactivate them one by one to find the culprit. If it didn’t help, please temporarily switch your theme to a standard WordPress theme, for example, Twenty Twenty, and see if it makes any difference.
As a kind reminder, It is very important that you update the plugins Elementor (3.0.16) and Elementor Pro (3.0.10). The latest versions not only introduce new features but also fix bugs that may exist in previous versions. Also, please make sure that your system follows all Requirements in order for Elementor to work properly. You can check this information in your WP Dashboard > Elementor > System Info.
In addition, I also suggest that you follow the steps listed below in order to give a try to address this issue. Please feel free to skip any step you’ve already made:
Troubleshooting Layout Issues
My changes do not appear online
Regards,
Said