Abstract: A designer application is used to generate multiple design layouts, each comprising a different arrangement of visual elements selected from a predetermined set of visual elements for a different presentation size. The designer application then displays a presentation interface partitioned into a number of respective sample spaces each corresponding to a different presentation size. A first of the multiple design layouts is displayed in the presentation interface, in connection with a first sample space of the respective sample spaces. In response to the size of the first design layout being adjusted to within a predetermined distance of, or to overlap, a second sample space, the designer application automatically changes the display of the first design layout to a display of a second design layout having the presentation size associated with the second sample space, with a different arrangement of visual elements from the predetermined set of visual elements.