How to Fix WordPress Not Saving Settings?

I had the same problem and in my case the reason why it didn’t work was that:

  • I use Divi

  • in functions.php Divi has function et_divi_maybe_change_frontend_locale and it returns ‘en_US’ by default.

Just change ‘en_US’ to your language.
Remember to use a child theme if you’re modyfying functions.php

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