Even when we don’t have mixed content issues, we need to replicate the next steps:
• Go to WP Admin > Elementor > Tools > Replace URL and replace
http://mysite.staging.wpengine.com
with
https://mysite.staging.wpengine.com
• Edit the wp-config.php and set:
define( ‘WP_SITEURL’, ‘https://mysite.staging.wpengine.com’ );
define( ‘WP_HOME’, ‘https://mysite.staging.wpengine.com’ );
Additional information:
https://github.com/elementor/elementor/issues/4679#issuecomment-399303395
