The Classic Editor plugin was used to disable Gutenberg on my site, by someone who was helping me.

The site was copied to another server and the Classic editor plugin was removed without switching back the setting. (Also the domain for the new server is different.)

I am using Divi, but want to edits posts with the Gutenberg editor

Now the site is stuck with the Classic editor

I reinstalled the Classic editor plugin and switched back to the Block editor as the default.

But the change is ignored – I cannot access the block editor

Every time I edit layout a new custom field appears:
classic-editor-remember
value :classic editor.

Even if I remove it, it comes back when I edit the page again.

Suggestions?