A method includes: displaying a first view of a first application; detecting a first portion of a first input; if the first portion of the first input meets application-switching criteria, concurrently displaying portions of the first application view and a second application view; while concurrently displaying the portions of the application views, detecting a second portion of the first input; if the second portion of the first input meets first-view display criteria (liftoff of contact detected in a first region), ceasing to display the portion of the second application view and displaying the first application view; and if the second portion of the first input meets multi-view display criteria (liftoff of contact detected in a second region), maintaining concurrent display of a portion of the first application view and a portion of the second application view on the display after detecting the liftoff of the contact.