Horizontal (double row) menu doesn't close when on parent/child page.

Guys, Could you provide me more info, what we expect here for me it works as expected.

So, I have created such taxonomy structure for my menu and then recreated these items in my menu.

- Parent 1
- - Child 1
- - Child 1.1
- Parent 2
- - Child 2
- - Child 2.2

For example, when I click on Parent 1, it keeps open only subtree of Parent 1 and for example for child1 the same thing.

I just want to understand, what do we need
1) to update documentation about it
2) to update the logic
3) Nothing, because "Path Level" does the trick?