I'm facing a big trouble. I created lot of categories and subcategories, and when i wanted to add them to a Menu here begins the pain.
Thus, when we click on the "View All" tab, the categories/subcategories are not hierarchically organized. Therefore, it becomes impossible to add them properly to the menu.
This problem has been already discussed here Category hierarchy in list of categories do not display correctly when editing a post .
A plugin was developed to resolve this problem on EDITING POSTS SCREEN, but unfortunately it doesn't work on MENUS editing section.
The link to the plugin: Category Checklist Tree
It seems that many people are facing the same problem.
I will be very happy if you help us resolve this issue.
Many thanks in advance.