From the Class Summary page under Class Options, click on Edit to find the Access Options. In this section the following access options are available:

• Student Enrollment Status can be set to Open or Closed, to allow or prevent students from enrolling this this class.
• Class Access can be set to Regular or Denied, to allow or prevent currently enrolled students from accessing this class.
• The Archive Status may be set to archived or unarchived (Sec. 7.4.40).