502 Error When I Try to Edit with Elementor

If you get a 502 error when you try to edit with Elementor you have to do two things:

Go to  Elementor > Settings > Advanced, and under 'Editor Loader', enable 'Switch front-end editor loader method'.

This setting changes the Elementor editor loader method.

You then may need to increase a particular Apache service limit. To do that, add the following lines inside the website's .htaccess file:

<IfModule mod_substitute.c>
SubstituteMaxLineLength 10M
</IfModule>

You can edit that file via SSH, FTP, or the File Manager tool in cPanel.