Why Can't I Edit This? (Aargh!)

I want to edit the Front/Back matter format, as seen here:

but when I hover over it, there’s no pencil icon that appears that will let me edit it. I’ve double clicked, right clicked, and tried everything.

I want it to be like this, but I can’t edit it!

So frustrating!

Can you assign a different Section Layout and edit that?

Katherine