A portable multifunction device identifies a plurality of user interface objects. If the user interface objects meet a first predefined condition, the device then displays at least two of the user interface objects on a touch screen display. If the user interface objects meet a second predefined condition, the device then divides the user interface objects into at least first and second groups of user interface objects and then displays a first group icon corresponding to the first group and at least one user interface object from the second group on the touch screen display. If the user interface objects meet a third predefined condition, the device divides the user interface objects into at least third and fourth groups of user interface objects. The device then displays a third group icon corresponding to the third group and a fourth group icon corresponding to the fourth group.