This option allows you to group staff members on the staff page. Like the example below.

To do this edit the first staff member in each section. And select the "Start New Row?" option then type in a title for the new row.

So in our example at the top we:
1. Edited John Smith Jr selected start new row and put in the title Pastoral Staff
2. Edited Mary Church selected start new row and put in the title Church Staff
3. Edited test1 selected start new row and put in the title Test People