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Hidden Content
If your course is a Work-in-Progress you can hide course content from students till you are ready for them to access it. This will prevent students from accessing content early and becoming confused or concerned about the content. You can also restrict access to activities (and sections) to prevent students from accessing activities and/or resources until certain conditions are met.
NOTE: Hidden activities will affect the grades you see in the Grader report, but will not affect the grade the student sees in the User report.