You want to remove auto synchronization of pages/posts when duplicating them, as you need manual translation.
Solution:
After duplicating a post/page to a secondary language, open the duplicated post/page for editing and click on the Translate independently button. You can find more details on this step here: Translate Independently.
Then, return to the original language post/page and modify it to see if you are getting the expected results.
If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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. Should you need further assistance, please do not hesitate to open a new support ticket or visit our support forum.
