i don't have fullmonty so not sure if we are talking about the same thing
if you want to resize widgets you need to unlock widgets first, in the desktop right click/unlock widgets
when you move over each widget in the desktop when unlocked they will offer a border with 4 buttons, the first is to resize the widget
the second is to rotate the widget, hold it and rotate it, you can turn it up to 360°
the third is to configure the widget, each widget offers different options to configure
the X button is to remove the widget
i know that fullmonty is different to normal kde so the descriptions i gave you might not work but since no fullmonty user replied, i tried with this info, hope it helps