customizing line thickness for non-plot function graphs

Hi,

I'm using the SISOtool control systems design toolbox and want to find a way to get thicker lines for my graphs. In particular, I am referring to the analysis plots that are generated by the SISOtool GUI such as the step response plots.

Usually I double click on a line, and am able to change the line thickness. However in this case, I am unable to do so. Anyone have any tips for this?

[Jan]

Why are you unable to click on the lines?

[aaa]

I'm not sure. When I try to double click the lines, no additional screens come up that would allow me to change the line thickness or the color. So I am wondering if there is there some way I can manually code, or edit this?