Answer
Yes, the symbols that the toolbar uses to display its graphic elements on the map can be controlled. All marker symbols, as well as the line symbol used to display the buffer when finding all the points of interest within a specified distance with Find Points of Interest, are displayed with the default symbols set in the Default Symbol Properties dialog box. To access this dialog box, turn on the ArcMap Drawing toolbar. The route line cannot be changed; it is always a 3pt red line.