Currently, the only way to remove users from Schedule Maker would be to delete their enrollment for the following year, and any future enrollments you do not want them to appear in Schedule Maker for. 

As a Platform Manager:
  1. Navigate to Core.
  2. Using People Finder , search for and select the preferred student.
  3. Select the Access Tab
  4. Expand the Student Persona > Select the Pencil Icon> Select Student Enrollment.
  5. Select the trashcan icon to delete the preferred Enrollment Rows.
  6. Select Save