[Resolved] "Choose a menu" option in "New menu language switcher" relates to previous theme

Problem:
The client is trying to insert a language switcher in the header using the 'menu language switcher' option in WPML but faces issues with the dropdown menu only showing options from a previous theme, not the current theme. Additionally, inserting a WPML block in the header breaks the header into multiple lines.
Solution:
We recommend going to WPML-> Languages-> Menu Language Switcher and deleting the old switcher. Then, edit your header/navigation template and add a new switcher block. If this does not resolve the issue, placing the language switcher in a column within the header might prevent it from breaking into multiple lines.

Please note that this solution might be outdated or not applicable to your specific case.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 problem persists, please open a new support ticket at WPML support forum for further assistance.