Elementor stuck on loading

When Elementor is stuck on loading or settings of widgets are not loading most likely this is the cause of lack of memory. 

There are two places you need to increase memory. 

1. In the WP Config file, add this line:
define('WP_MEMORY_LIMIT', '512M');

2. In your PHP settings change PHP.ini 
This can usually be done via Cpanel or by contacting your hosting provider.
You should increase this setting to the maximum available.