Making a Moodle Course Unavailable to Students

Each fall, about a week after classes start I have several phone conversations almost exactly like this:

Me: "Hi, this is Lisa"
Student: "Hi, do you do Moodle stuff?"
Me: "Yes, what can I help you with?"
Student: "I'm still seeing, like all the classes I had last year and the year before when I login to Moodle. Can you get me out of those classes?"

This simply means that old courses are still listed as available to students. A simple remedy is to make the course unavailable to students. This doesn't affect your ability to look at the course, it doesn't delete any student contributions/data or grades from the course, it just hides it from student view.

Here's a short video showing the steps to make a Moodle course unavailable: