If you are looking to simply thin the number of courses visible on your home screen, go to your home page. Place your cursor in the upper right corner of the My Courses module and click on the icon that looks like a tiny gear.
This will take you to a page listing all the courses in which you are enrolled. Simply UNCHECK any courses you don't want to see in your course menu. This keeps them available for future reference.
Repeat the steps above as if you were going to hide a course except instead of unchecking the course boxes, you'll simply CHECK the courses you want to see.