[Resolved] Adding Language Parameter to Default Language URL

Problem:
You are using WPML on your WordPress website and want the default language to include a language parameter in the URL, such as accessing the Dutch version at example.com/nl/ instead of just example.com/. However, you couldn't find an option in WPML settings to enforce the inclusion of the language slug for the default language.
Solution:
To include the language slug for the default language, you need to activate the "Use directory for default language" checkbox. You can find this option by following the guide provided in the WPML Directory for Default Language documentation. Remember, this option requires a root page, as explained in the guide.

If this solution does not apply to your case, or if it seems outdated, we recommend opening a new support ticket. We also highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. For further assistance, please visit our support forum at WPML support forum.