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Problem:
The client added new pages in Turkish, duplicated them, and translated them into English. These pages were assigned to related menus and categories. However, the language switcher did not appear in the primary widget area on these new pages, although it appeared when the style was changed from 'Horizontal List' to 'Dropdown'.
Solution:
We identified that the issue might be due to the absence of a header template which is necessary for displaying the language switcher in the header. If the page is neither duplicated nor translated, the language switcher won't show up in the header. To display the language switcher on pages that do not have translations, we recommend using the fallback option. You can find more information on how to implement this by visiting Displaying Untranslated Content.

If this solution does not resolve your issue or seems irrelevant due to being outdated or not applicable to your case, please open a new support ticket.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, you can contact us through the WPML support forum.