Systems, methods, and user interfaces for interacting with multiple application windows

While concurrently displaying a first application view and a second application view in a first concurrent-display configuration of multiple different concurrent-display configurations, a first input that includes movement is directed to the first application view and drags a representation of the first application view across the display. While the representation of the first application view is dragged over different portions of the display, different visual indications are displayed to indicate that an end of the first input will result in the first application view and the second application view being displayed in a respective one of the different concurrent-display configurations. In response to detecting the end of the first input, depending on over which portion of the display the first input ended, the first application view and the second application view are displayed in a corresponding concurrent-display configurations of the multiple concurrent-display configurations.