In an exemplary method performed at an electronic device with a touch-sensitive display. The method includes concurrently displaying a first application and a second application on the touch-sensitive display. The method also includes detecting a first contact at a border between the concurrently displayed first and second applications. Immediately following detecting the first contact: detecting a gesture from a location of the first contact towards an edge of the touch-sensitive display. Upon detecting the gesture: selecting a fixed display area from a plurality of predefined fixed display areas for the second application; automatically resizing the second application to the selected fixed display area; and automatically resizing the first application to occupy substantially all of a remaining area of the touch-sensitive display.