Sometime Elementor not loading or loading screen get stuck. This case may occur when you update plugin or if you having server issue.

If after update plugin Elementor not working then please clear cache from everywhere such as browser, cache plugin(if you are using any), CDN (Cloudflare etc).

After clear cache if still not working please try to check on another browser. 

Still no luck then please go to WP Dashboard > Elementor > Settings > Advanced > Switch Editor Loader Method > Enable.

For more details and issue about Elementor please check their documentation as well https://docs.elementor.com/