I have a similar experience with the settings catalog.
Some categories do not show any settings unless I'm explicitly searching for them. If I just choose the category, it will just tell me "Select a category to show settings".
This is the case with Administrative Templates > Windows Components > Internet Explorer for example.
I can "Select all these settings", but then I would have to remove again everything I don't need from my Configuration Profile.
When I already know what setting I am going to add, I can search for the setting name (for example "Standalone") and it will be shown within the "Internet Explorer" category.
But as far as I know, there is no way to go through all of the settings and simply pick the settings I want from that category.
EDIT:
I just noticed that the behavior is not consistent. It is showing for a colleague, but not for me. I can see the settings in the subcategories though.
Also my colleague is seeing a different number of available settings - 65 settings in "Internet Explorer" subcategory vs. 51 settings in "Internet Explorer" subcategory.