If an instructor wants to hide the classlist in a D2L course (for privacy reasons, so students can’t see who else is taking the course), click in the “Edit Course” link in the red navigation bar. At the bottom of that page should be an “Administration” section that looks like this:
Click “Tools” to see a list of tools that are available in your course. There should be an item in that list called “Classlist”. Toggle the switch for that tool so that it looks like this:
Now, go back to the Course Home for that course, and Classlist should not be in the menu. If you decide to enable it, just reverse the Classlist tool switch so that it’s active again.