If you have hidden a student's course, you can add it back to the default view.
To show hidden courses, go to "Tracking" and select "Show hidden courses" in the bottom left corner to bring up a list of courses that have been hidden.
Select the courses you would like to add back to your default view.
Click on the eye icon in the top left corner and select "Show selected courses".
These courses will now be added back to your default view.