A computer system displays a first user interface object with a first appearance at a first position in a first view of a three-dimensional environment that is at least partially shared between a first and second user. While displaying the first user interface object, the computer system detects a first user input by the first user. In response to detecting the first user input: in accordance with a determination that the second user is not currently interacting with the first user interface object, the computer system performs a first operation; and in accordance with a determination that the second user is currently interacting with the first user interface object, the computer system displays a visual indication, that the first user interface object is not available for interaction, including changing an appearance or position of the first user interface object, and forgoes performing the first operation.