Solved Blog-Post settings changed from Gutenberg-Block-Editor to "page created with Divi Builder"

Hello all,
I have a problem with my blog posts. I created many blog posts containing image galleries with carefully placed images that I need to keep that way. After a break of 2 weeks of working on the site, the newest Wordpress update and some changes on the global header menu and the footer, I was not able to edit the blog posts in the Gutenberg editor anymore. Wordpress only shows me a message saying "this layout was created with Divi Builder" (see picture "ThisLayoutWasCreatedWithDiviBuilder"), which is not correct and means I can't work on the blog post anymore without using the Divi Builder. Furthermore, since this situation exists, all the image galleries that I created in the Gutenberg editor seem to have vanished. All the images now appear way bigger and one below another. Before, I placed them 3 in a row and 2 below them or similar, depending on the images. (see picture "NewImagePositioning")

This is the link to one of the blog posts.

https://guide-to-afrika.de/?p=51892&preview=true&_thumbnail_id=50629

I know the site is far from finished and has a lot of work to do and I would really appreciate if someone would help me with the problem.

 

Update: I figured out how to reinstate the image galleries by switching back to the standart editor in the Wordpress backend blog post editor. However, as soon as I do that, the global menu I created with Divi Ultimate doesn't appear correctly anymore. In other words, as soon as I activate Divi Builder, the menu appears correctly, but the image gallery stops working. As soon as I deactivate the Divi Builder, the menu stops working but the image gallery works. One step closer to the solution, but I still am confused. I'd be thankful for help.

 

The first option worked! Thanks a lot.