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Problem:
The client was experiencing an issue where the WPML language switcher disappeared from the header menu after attempting to move it from the last item to the first item.
Solution:
We asked the client to describe the exact method and steps they used to add the language switcher to the menu. Additionally, we requested temporary access to the client's site (both wp-admin and FTP) to investigate the issue further. We assured the client that we would check various settings in the backend without making changes that affect the live site. We also advised the client to back up their site before providing access and informed them of our privacy and security policy, which can be found at https://wpml.org/purchase/support-policy/privacy-and-security-when-providing-debug-information-for-support/.

If you're experiencing a similar issue with the WPML language switcher in your menu, we recommend checking your method of adding the switcher and ensuring that you follow the correct steps. If the problem persists, please do not hesitate to provide us with temporary access to your site for further assistance.

Please note that the solution provided here might be irrelevant due to being outdated or not applicable to your case. We 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. If the issue still exists, we encourage you to open a new support ticket for personalized assistance. You can do so at the WPML support forum: https://wpml.org/forums/forum/english-support/.