I noticed this over on @john_mardlin’s community.coinbase.com, where show subcategory list is enabled.
If I go to…
https://community.coinbase.com/c/coinbase-support
There is no “Latest, Top, New”
However, if I go to…
https://community.coinbase.com/c/coinbase-support/mobile-apps
There is.
I thought “maybe there’s a good reason for Discourse behaving like that when sub-categories are listed”, but then I noticed that the “Latest, Top, New” menu was also suppressed in parent categories that didn’t have any sub-categories, like this one:
https://community.coinbase.com/c/announcements
That strikes me as a UX glitch. I reproduced this on Try to confirm that this isn’t happening due to a customisation on Coinbase’s forum.