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Once you are inside of your course, on the left of your course menu, click "Users and Groups" under Control Panel
Click "Users" to view all course users
Locate the student you want to make change to. move your mouse over and click the small chevron arrow next to the student's username.
Click the "Change User's Availability in Course" Option. You are open the "Change User's Availability in Course" page.
Select "No" from the dropdown menu and click "Submit" to save your settings. The student no longer have access to your course.