Heads up! This blog post hasn't been updated in over 2 years. CodePen is an ever changing place, so if this post references features, you're probably better off checking the docs. Get in touch with support if you have further questions.
I know this happens to me a lot. I’m viewing a Pen in the Editor and I want to see what the author had to say about the Pen. You can’t see that in the Editor, you have to switch over to Details View. Well not anymore. We’ve added the ability for you to pop open a new area to see that information right from the editor.
This video will show you what I mean:
We hope this makes it easier to learn about Pens and interact with the authors. It sure makes commenting about the code itself easier, since you can be looking at the code and writing a comment on the same screen (that’s why we put it down below in the same place Assets go).