XCode Interface builder missing view hierarchy

Question

I've just installed Xcode 6.4 on a new macbook and started a new project for some reason i can't find the view hierarchy usually present on the left hand side where i can see which views sit in which....

Hopefully this explains what I mean:

-view
---view
----label
----button
---view
----label

Answer 1

It may be hide state. To show click icon where is shown in screenshot.

OR

as @Jeff metioned in comments you can do it with Editor->Show Document Outline. For more info