[Решено] I changed the default language but

Background of the issue:
I created the website with DE as the default language. Now I want to change the default language to EN, which should be edited in Elementor, while DE and NL are only translations.

Symptoms:
The message 'Warning: Edits you're about to make will be lost. You are about to edit this translation using the standard WordPress editor. Any changes you make will be lost the next time you send this page for translation.' keeps showing when I edit the EN site.

Questions:
How can I set it up so that the warning message appears in DE and not in EN anymore as EN is the new default language?