How do you change the size of toolbar buttons

I have a user that is visually impaired. I have a grid and form application set up for him to use to update some data. I was able to make the field font sizes very large by modifying the font size on each of the fields. I would also like to make the buttons in the toolbar at the top larger as well but haven’t found where I can do that. Is there a place where I can modify the size of these buttons (Add, Save, Delete, Exit, etc.)? I’m pretty new to Scriptcase so I may just be overlooking something.

​Thanks.