It's missing for everyone! The product has been updated with a new Design Center. For our MuleSoft.U Fundamentals (Mule 3) course, the videos were recorded before the releases in July and November 2017. In order to successfully complete the course, you must create a NEW trial account.
When you come across a video that does NOT match what's live in your new trial account, use the links at the bottom of each module to the Updated Slides and Updated Student Manual to get the latest training.
For our MuleSoft.U Fundamentals (Mule 4) course, everything should be up to date with the latest releases.