It's trial and error trying to get the desirable layout in a diagram. This is made more difficult in the absence of an Apply button in the layout dialog boxes. Currently one must click OK to apply the layout and observe the results, only then to have to re-open the dialog box, and find the control that was being experimented with and do the whole thing again, over and over again in most cases. An apply button would render the results without having to leave the control / and tab in the dialog box. Please add this. Apply an apply button :)