As has been said, if you click on 'View All Categories' there should be a + symbol next to 'Society & Culture', allowing you to expand that section. (It's there for me).
However some people were saying that they couldn't see the sub-sections just a day or two ago. It might be related to specific devices and/or browsers. (There have been reports across the years of AB not always loading properly when using Safari on an iPad, for example).