ZBrushCentral

Custom UI Question: Resizing Brush Buttons

I have run all over the internet in the last hour looking for this, but from the Zdocs to random forums, i cant seem to find the answer.
What i am trying to do is Resize the Brush icons. I saw in This video that you can resize them. But i just cant figure out how.
Does anyone here know how?

Cycle through the UI Layouts on the top until you hit a good starting point for yours.

preferences.interface.ui.wide buttons

Thank you.