The Applications launcher can show and should start the different specific settings under System Settings. 

In my case they **do not** start if clicked.

[![enter image description here](https://i.stack.imgur.com/DDFfM.png)](https://i.stack.imgur.com/DDFfM.png)

'Systems Settings' can be started in this way, but not its sub-settings.

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Update after the subsettings have been completely absent in Slingshot but then appeared again after update, and a [post is saying this was fixed](https://elementaryos.stackexchange.com/a/10620/170):

There are still many sub-settings that are not accessible from slingshot.