The 'Best Available Max Seats per Row' field has been added to the Application Security application Roles|Basic page. It defines the maximum number of seats that will be allowed per row when using best available.
For example, if this value is 5 and an Online user requests 24 seats, best available will return four rows of five seats and one row of four seats.
If this field is empty best available returns all of the seats in single row.
Desktop users can override this value using the Customer Services application Seats|Best Available page's 'Number of Rows' field.