Currently graphs in the presentation server are not resizable. Dashboards have much more utility when they have drag-and-drop, widget-based interfaces with resizable, customizable graphs. Here's a screenshot of a graph in TSPS.
This would easier to use if we could resize the graph itself and change the metric scale from within the presentation server interface.
Just as an additional
The problem is more than aesthetic, it actually affects the perception of the graph as well.
By elongating the x axis you are flattening any slope that may be occurring.
Below are the same graphs. One from the Presentation Server and one from Truesight.
They tell different stories. It is almost impossible to discern any peak on the 24th September for the red line.