On the Discussion page, you cannot see category and subcategory names of discussion components that you created until after the course has started and the unit is released. For more details about when discussion topics are visible, see Understanding When Learners Can See Discussion Topics.
When you add a discussion component to a unit, in the LMS, learners see only the discussion, together with the display name of the discussion component, the category, and the subcategory. EdX recommends that you add an HTML component before each discussion component where you add some text to introduce the discussion topic.
In the following example, the discussion component follows an HTML component. Learners select Add a Post to post their own contributions.