To do this, navigate to:
  1. Core > Content > Directories
  2. Click the editing pencil on the Faculty & Staff Directory
  3. Change Display and Group by from Department, to None 
  4. Click Save
Users can still filter by the Department on the Directory itself, however, the Departments will not display when printed. With the Group and Display by Department being selected, this causes the Employees to display individually, AND in each Department they are associated with.