How come system settings windows behave this weird?

From this photo, you can see that under Hardware there are a bunch of stuff, such as
Input Devices
Display and Monitor

Why in search field, when i type hardware it shows only Thunderbolt ? This search is not helpful at all if it behaves like this.
It is the same with others search.

I don’t think it searches the section headers. The point of it is not to limit the size of the sidebar it is to search for a specific function/setting/page.