This thread is resolved. Here is a description of the problem and solution.
Problem:
The client is unable to see the English version of their menu despite having translated the content and following WPML documentation.
Solution:
1. Ensure that the site meets the minimum requirements for WPML.
2. Update the theme and plugins to the latest versions.
3. Follow the step-by-step instructions for translating menus provided in the WPML documentation.
4. Enable the "Adjust IDs for multilingual functionality" option from the WPML >> Languages page.
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