With the new version of WordPress 5.0, Elegant Themes (the company behind Divi), has dropped the usual Divi Builder editor. I’m talking about the editor in the admin area with modules an no visual preview. They have dropped it in favor of the Visual Divi Builder.
If you have not gotten used to the Visual Divi Builder you will have to, because there is no way around it (for the moment).
I have not contacted Elegant Themes about this, but the drop seems to be related to the complete reshaping of the Default Wordpress Editor. With which I’m writing this post. This is complete speculation, but since Elegant Themes launched Divi Visual Builder, they had to maintain two pieces of software, which must have become to daunting since the complete update of the WordPress Default Editor, and that is why they ended up dropping the old Divi Builder altogether.