You have to be careful when unsharing a Class, as you don't want to unenroll any Enrollees unintentionally. Follow these steps to properly unshare a Class:
Step 1 - Go to Originally Shared Class
Go to the Class that you originally shared to unshare the Class.
Step 2 - Click Shared Button
Click the "Shared" button, then deselect the Class. You will know if you are in the right Class, as it will allow you to deselect the Class and save the changes.
Step 2b - In Wrong Class
If you get a notification like the one below, you are trying to unshare the wrong Class (the Class that is inheriting the characteristics of the Class being shared and NOT the Class that is being shared):
NOTE: If you click "Continue" here, you will UN-ENROLL all the listed enrollments! This CANNOT BE UNDONE!
If you do unenroll the Enrollees and the Enrollee is not enrolled in another Class within the same Program, the Enrollee will be moved to the Unassigned List. If the Enrollee IS enrolled in another Class within the same Program, they will NOT show up on the Unassigned List and their enrollment will be removed.
To go to the correct Class, click the "Back" button to go back to the Shared screen. See which other Class that Class is shared with and click on the Program and the Shared button on THAT Class. Go back through Steps 1-3 above to unshare the Class.