I recently discovered that I can read. And I did it. I just searched for similar problems and tried to model the people who successfully fixed it. I now it works. My brain and you guys who solved it before are incredible. :-)

Have a nice day :-)

Just install the Classic Editor as a plugin. Switch On, Switch off. Thats it.
Layout builder shows up and everything is alright.

• This reply was modified 5 years, 8 months ago by martingasiorek.