I have read all the posts related to the problem but the problem isn't solving. You can click on the link below.

The content area has shrunk and SEO Yoast fields can't be seen. I have done already;

1. Disable all plugins and reactivate them one by one
2. Check the website in the health checker plugin
3. Already check the Add post by activating default theme but the problem persists.
4. Rename/ delete the.htaccess, update the permalink
5. Already checked by instaling disable gutenberg plugin
6. All plugins/ WordPress are up to date.

Any help will be appreciated. Also, if I delete the classic editor plugin, the page goes blank.

Regards