Resizing Matching Drag and Drop boxes - Storyline

Hi, I've been reading through the community to find a way to resize Matching Drag and Drop boxes, as Jeanette demonstrated for Quizmaker slides. 

I have a slide with boxes that are all the same size, but the fonts are all wacky sizes because some boxes have more content than others - and I'd like to size the boxes to be big enough to fit the largest content - and the fonts to be the same across the board.

Reading different sized fonts on the same slide (and across the entire CBT course) is very hard on eyes.  I'd like to make it easier on the poor learners.

Can't find information to resize boxes (and ergo fonts).   Can it be done? How?