Can't view Storyboard and swift code on the same screen

This may seem a stupid question but I can't figure out how to set the screen to show the storyboard on the left and the swift code on the right. I am new to Xcode and am working through an exercise and need the Storyboard scenes and the specific swift file where I need to drag from the scene to the swift file. I have clicked on Assistant and the assistant editor should be set to Automatic > LocationViewController.swift. I assume that the icon with 4 squares is where an option is Automatic, but it is set to an .h file. I don't know how to change this. Can someone explain how you can control the views?