I haven't found a way to resize a checkbox set checkbox without affecting the associated value. For example, If I have a checkbox set for Red, Blue, and Green, and I want to reduce the size of the "red" "blue" and "green" text without affecting the size of the checkbox. I have no way of doing this without some convoluted manipulation of the objects.
There should be a way to adjust the graphical objects inside the checkbox set and the text represented by each checkbox separately inside the Inspector dialog.
I would love for someone to explain it to me if I'm missing something that should be more obvious.