For a front panel (which is what I think you mean instead of diagram), you've got the properties Window Bounds and Origin that give you the ability to move it around and resize it. For a graph, use the Position and Bounds properties. Also, there's a lot of possibilites besides changing the size of front panel objects and the front panel itself. You could have the graphs display as pop-op subVIs and change the position of each subVI so that they tile on the screen or experiment with the visible property.