Hi, I updated today the Theme, but now there is no way to change the site main image. The menu has disappear and the documentation shows how to do it with the former version only.
I hope you are well today and thank you for your question.
Can you verify that the illy companion plugin is installed and activated?
WordPress > Appearance > About Illdy > Recommended Plugins.
If it is, try disabling all third party plugins except the ones recommended by the theme, and check to see if you’re able to customize. If you are able to, activate the plugins one by one to find the cause of the issue.