Creating a new topic to discuss this
The Boxes
These boxes are just a setting that I’ve enabled. They can be disabled if users find it confusing.
But I think the reason for the confusion is not so much the boxes, but rather the fact that the “main” category is the parent category. See bellow:
User Support --> Main Support category
├── Hardware Support
├── HCL Reports
├── How-Tos
└── Testing 4.1
So following your explanation @ToastedCoral when one jumps into the “User Support”, then there is no box for let’s say “User Support”.
If this is the problem one possible solution could be to create a subcategory for general questions such that no “user support” post would land on the parent category.
Unlike Renaming "How-Tos" category this is a problem that is hard to assess we can’t see users doing the mistakes. So let’s see if someone else also complains about this.
Further feedback from the user @ToastedCoral, who is having usings using discourse (being followed up here). I’ll paste here the feedback.

Exactly right. It looks like you’ve arrived at the User Support section, and you must choose from these 4 options.
I think this is a general issue on the first experience of posting an new post. So I think we should create a category Support
or General Support
.
User Support --> Main Support category
├── General Support
├── Hardware Support
├── HCL Reports
├── How-Tos
└── Testing 4.1
@adw, any thoughts?
I understand his complaint to be about how the subcategories are visually presented, not about the naming or organization of the categories.
I am sorry, it seems like this post has sat in my “draft” pane for many days.

So following your explanation @ToastedCoral when one jumps into the “User Support”, then there is no box for let’s say “User Support”.
If this is the problem one possible solution could be to create a subcategory for general questions such that no “user support” post would land on the parent category.
Sorry for taking so long to reply.
This extra box would work perfectly for someone like me.