It seems that UE4.12 automatically generates UI for sub categories. So after I upgraded, I got this extra titles:
There are extra titles besides the groups I added using IDetailCategoryBuilder::AddGroup().
I can’t find a way to hide these extra titles :(. HideCategory() or anything like that doesn’t work.
I also tried to directly apply customization on sub categories. I get sub categories, using IDetailLayoutBuilder::EditCategory(), passing the category name, which contains a |. then I call IDetailCategoryBuilder::AddProperty(). But after this, properties are gone. I can’t see these property UI.
Any way to correctly add customization on properties of sub categories.