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At the end of a semester, if a Canvas Course does not appear in the Published Courses tab and is only visible in the All Courses panel, please do the following to make it available again in Published Courses and visible to your students again.
From within the course, navigate to Settings, then scroll down to Participation. Change the Participation field from Term to Course. The Start and End dates will become editable for teachers to choose the End date. This will make the course available to students to finish submitting course work.