Sounds like you have a plugin that might be conflicting with Divi. You can use the Health Check plugin to help you debug the issue https://ww.wp.xz.cn/plugins/health-check/. If you determine it is not a plugin issue you will need to contact Elegant Themes for support as they are the developers of your theme and they are aware that we do not support their code here on wp.org.
https://www.elegantthemes.com/members-area/
Hope this gets you headed in the correct direction. Please tag the thread resolved once you find a solution.
Hi
In eleganthemes (divi’s developers) really tried to help me, but the problem is not of Divi. The issue are the same with the WordPress default template, and is the same if I disable all the plugins. I had the default Twenty Nineteen theme and no one plugin enabled and the issue are still there. I re-installed the 5.2.3 WordPress version and the issue is there. I don’t know what more to do.
Out of curiosity what browser are you using? I tried before my reply a few days ago in chrome and firefox, I was not able to duplicate the problem you described.
I’m using Chrome, but I also tested with Safari. I’m thinking in PHP configuration maybe? Do you know about it?
Yes, that was going to be my next thought. Make sure you are using php 7.x. The menu settings can be very finicky if you are on php 5.x I’ve had headaches with it in the past on installs that were using php 5.x
No, excuse me the delay, I have PHP 7.3.
I just fixed it.
I think there was something corrupt in the PHP version, maybe in PHP selector > extensions, because I changed the PHP version from 7.3 to 7.2, without results, but then I re-selected version 7.3 then I could subordinate a menu item to the link “Index” in the menu, but not to the page button that interested me (“Containers”), then I deleted it and reloaded it, and then, only then, it worked.
Thank you, This was turned me crazy because was a silly problem!
Thank you again.