Devices, methods, and graphical user interfaces for interacting with three-dimensional environments

A computer system presents first computer-generated content. While presenting the first computer-generated content, the computer system detects first movement of a first user in a physical environment, and in response: in accordance with a determination that the first movement changes a spatial relationship between the first user and a second user in the physical environment from a first spatial relationship to a second spatial relationship and that the change in spatial relationship meets first criteria, the computer system changes one or more output properties of the first computer-generated content; and in accordance with the determination that the first movement changes the spatial relationship from the first spatial relationship to the second spatial relationship and that the change in spatial relationship does not meet the first criteria, the computer system presents the first computer-generated content without changing the one or more output properties of the first computer-generated content.