The new system setting design proposes a master / detail pattern. The left menu is the master and the content is the detail.
The core of the pattern it's the selection feedback. It's important to give good feedback that something selected in the left menu is represented in the right part of the screen.
It happens with all the sections within System Settings
Steps to reproduce (e.g. blogs)
Product Menu > System Settings > Blogs
Select Blog Service
The selected menu item its viewed exactly the same as the other menu items.
The selected menu item (Select Blog Service) should have bold as it is defined in