How can I remove size class from Xcode 6.2?

I'm working in a new App using Xcode 6.2 but now I want to remove the size class from my storyboard but I don't find the option to remove it. How can I do this?

The default setting for any project in Xcode 6.x has Auto Layout and Size Classes enabled. You can disable them manually using below steps :

1. Select View Controller present in Main.Storyboard
2. Click on Utilities if it is hidden
3. Click on Show file inspector
4. In Interface Builder Document section simply uncheck Use Size Classes.

5. This will prompt a message Disable Size Classes?
6. Click on Disable Size Classes