Hello,
I made a new installation of WP in a subdirectory : www/wp2017/, where I setup Enfold with WPML (3 languages with French as main language, English and Chinese). The frontend url were : madnetwork.fr/wp2017/ (in French), madnetwork.fr/wp2017/en/ (in English) madnetwork.fr/wp2017/zh-hans/ (in Chinese).
To go online I changed WP > Settings > General Blog
WordPress address (URL) : https://madnetwork.fr/wp2017 (unchanged)
Site address (URL) : https://madnetwork.fr (previously https://madnetwork.fr/wp2017 ).
I copied the .htaccess and index.php files in the root directory according to https://codex.wordpress.org/Giving_WordPress_Its_Own_Directory

After that the URL with virtual country folders ( https://madnetwork.fr/en/ and https://madnetwork.fr/zh-hans/ ) stopped working and redirected to index after a while. I tried to refresh permalinks with no success, and I am now forced to use https://madnetwork.fr/?lang=en to display the English page.
I also noticed that Enfold language in admin is now Chinese by default and that quick CSS are not saved (they are OK in the database, not in the custom language CSS file ( for example /wp2017/wp-content/uploads/dynamic_avia/enfold_en.css)

Let me kwon if you need further information,
Best regards

Olivier