When the User Role Editor plugin is added along with the Divi theme, even Administrators can’t access the Divi > Divi Library post types. It says:
You need a higher level of permission.
Sorry, you are not allowed to edit posts in this post type.
This is happening when trying to access …/wp-admin/edit.php?post_type=et_pb_layout
I think part of the issue is that the post type isn’t showing as an option within User Role Editor. So it doesn’t know to give the Administrator permission: https://freshysites.d.pr/bAMYCG