Why can't I use the show segue in xcode 6.1?

Question

So I was doing a test for another swift project and I wanted to connect a TableViewController that had a NavigationController embe

Answer 1

The new adaptive segue choices, "show", "show detail", and "present modally", and "popover presentation" are only available if you're using size classes. This makes sense because there's no need for the segue to be adaptive if you're not using size classes.