Okay, I will try again.
Having all course sections showing in the NavDrawer seems to be redundant to what you might be seeing in the middle of your course. And, if you are using Collapsed Topic and Close All, this redundancy is very visible. So by making the changes that I mentioned, you remove the sections from showing in the NavDrawer and then just see available courses.
However, when you do switch to single topic mode in Collapsed Topics, then seeing all available course sections in the NavDrawer makes sense.
This is the (good) kind of functionality that Collapsed Topics provides. (Again, good work Gareth.)