At an electronic device having access to a plurality of data objects: displaying a viewport comprising graphical representations of a first subset of the plurality of data objects that are ordered. While displaying the graphical representations of the first subset, the device receives a request to navigate through graphical representations of the plurality of data objects in the viewport. The request is associated with an input magnitude. In response to the request: generate a layout for a second subset of the plurality of data objects based on the input magnitude and an anchor within the plurality of data objects that was selected based on user input; and changing the content of the viewport by displaying graphical representations of the data objects of the second subset according to the layout.