ARKit book problem

I stuck with ARKit book! The author didn’t bother himself to at least explain how to use xcode. Could anybody help with this? Looks like my layout!

is different from the author’s one. I dont know how to drag and drop as I dont have it.

Maybe you should start with iOS Apprentice book

The one with ARKit it a bit more advance for beginner iOS

In Xcode 10 the Library button has moved to the top

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