In any context where a user can view multiple different content items, switching among content items is provided using an array mode. In a full-frame mode, one content item is visible and active, but other content items may also be open. In response to user input the display can be switched to an array mode, in which all of the content items are visible in a scrollable array. Selecting a content item in array mode can result in the display returning to the full-frame mode, with the selected content item becoming visible and active. Smoothly animated transitions between the full-frame and array modes and a gesture-based interface for controlling the transitions can also be provided.