It might be worth mentioning somewhere in the doco/tutorials that people with pre-existing projects won't be able to see the prefab controls if they have chosen not to import the example assets.
I never imported the example assets (assuming they were just examples and were unnecessary in my actual application). I was a bit confused when following along on the 3.0.6 video and the control searching bit didn't work for me. Everything works fine of course, it was just a bit confusing at first.
