Any reason debug wouldn't return info?

Specifically, I’m on page 87/88 of Checklists. Everything works and I tried copying code in, but debug is showing nothing.

is there any common reason why this wouldn’t return when I run the app and add a field and hit “done” ?

As usual when I ask questions, I’ve fig’d it out. Looks like I had accidentally hidden the half of the bottom pane that shows return. My bad.