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Problem:
The client is trying to hide the 'WPML Translation Editor / WordPress Editor' using the

wpml_tm_post_edit_tm_editor_selector_display

filter, but it is not working.
Solution:
We recommend using a simple CSS solution to hide the editor. Please ensure you have a live backup before applying this custom solution:

#translation-editor-post-settings{display:none;}

If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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 issues persist, please open a new support ticket at WPML support forum.