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In Course Navigation, click the Settingslink.
Click the Course Details tab.
When an instructor views the Participation section in the Course Settings page, the Participation section displays a menu that defaults to Term dates for new courses. This option sets student course participation to the start and end dates defined for the term.
Instructors can change course participation to the Course option, where course participation is limited to the course start and end dates, which can be added in the course. Course dates override term dates.