appearance – menu – menu structure not showing

Hi, Karen, & welcome. The first thing you might wish to do is to try reinstalling WordPress. If that doesn’t help, please try disabling your plugins by renaming your plugins folder, for example, by putting a 1 or a .old on the end. Let’s see if that helps. If it does, then we know that there’s a conflict w/a plugin. In that case, rename the folder back to plugins, but rename all plugins except 1 by putting a 1 or a .old at the end of the folder name. The best choice of a plugin not to rename initially is a core plugin like Akismet. Clear your browser cache & try to create a menu after each rename until you can’t, which will let you know which plugin is the problem.

You might also wish to request help w/the Divi folks, as that’s part of what you paid for.

That is a common misconception, Karen. There are actually 2 parts to a WordPress installation–the files that you see, & which I’m suggesting you reinstall, & the database, which you don’t see as readily, that contains your content. So if you just use FTP, (hopefully secure FTP) to reinstall the WordPress files, your content won’t be affected. You can also use your dashboard to do it as well. I do recommend strongly, however, that you back up your database prior to doing anything, simply as a precaution. You can learn how to do that here:
https://codex.wordpress.org/Backing_Up_Your_Database
or in a slightly more abbreviated form here:
https://brighter-vision.com/2016/07/24/backing-up-your-database-with-phpmyadmin/

Please let us know if that helps.