When you set an academy-level board preference, it will be reflected to all your academy members. However, if you wish to change the board preference of a particular student (or a set of students) individually, go to the Students tab in the “Academy” section, and click “Edit” across the student you wish to change the board preference.
You will then see the student’s current board settings:
You can change the board colors and piece set for the student if you want to. And finally click “Ok“:
After that, you will see that the student settings has been changed successfully:
The student will see the change reflected in his boards and “Settings” section: