1s Bitrix subsections are not displayed?

Question

1C

There is one site on which there is this system. All the data has already been filled in
(There are goods inside the subsections), but when I go to a section that has subsections, the subsections are missing, for example:
And it should be like this:
What could be the problem? -subsection activity is enabled.
I don’t understand how to deal with this Bitrix at all. There is little time to learn materiel.
Tell me please