Can you change the size of the image in Forms Pro header?

Hi,

The image on the header for Forms Pro is very small.  I did an online search and saw on a microsoft support site/page that I could edit to make this larger but I don't have an edit option when I hover over the header image - only delete and add caption.  Does anyone know if changing the size of the image on the header in Pro is possible?  

Thanks for your help.

Susan