Changing font size on diagram packages

[Graham_Moir]

The default appearance of a package seems to be all the same font, but the package title is in bold while each item within the package is non-bold.    However if I change the font using "Appearance, set font..." this seems to be a global change for all text - title and items - displayed within the package on the diagram.
I can edit the title text on its own bt I don't seem to be able to set its font properties specifically.

Is there any way to get the bold type back for the title ?
thanks