Xcode 8 beta - How do you resize all view controllers in a storyboard?

Question

I previously used xcode 7.3 and just upgraded to xcode 8 beta, but in the process the dimensions of all my view controllers on the storyboard went from wider (iphone 6 plus size) to narrower (iphone 6 font size), It really messed up my limitations, and I was wondering how do I resize? Any help would be greatly appreciated.

Below is an image of the current size of the view controller in Xcode 8 beta

Answer 1

As in Xcode 8, in the lower right corner, select "Show as:" (and then the desired device)

Answer 2

Here you can set / select all available screen sizes