Currently WPML adds /fr/ to permalinks to identify a url as French. The default language of the site is English, however WPML does not add /en/ by default for the default lannguage (English) permalinks. Is there a way to have the default language also show up in the permalinks?
WPML – how to get the permalinks to display also the default language
EDIT: This feature has been added to the latest version of the plugin.
https://wpml.org/documentation/getting-started-guide/language-setup/directory-default-language/