By default, you will be able to see all classes in your school’s portal. The show classes ‘star’ is a way to filter your view of classes listed to display only those relevant to you.
Select the classes you wish to see displayed by clicking on the show classes star beside the class. If you have selected a class to include in your ‘my classes’ list, the star will turn blue. Click on the star icon again to remove the class from your ‘my classes’ list; the star will turn black. This setting will be retained each time you log in.
You can still toggle between your classes and all classes using the show all classes / show my classes drop down options.