A computer system detects a wrist. In accordance with a determination that first criteria that require an inner side of the wrist facing toward a viewpoint are met, the computer system displays a first user interface object including a plurality of representations of different applications at a first position corresponding to a first location on the wrist. While displaying the first user interface object, the computer system detects that the wrist's position or orientation has changed to satisfying second criteria that requires an outer side of the wrist facing toward the viewpoint. In response, the computer system switches from displaying the first user interface object at the first position to displaying a second user interface object including a plurality of controls for controlling functions at a second position corresponding to a location on a back of a hand attached to the wrist.