Adjust Vertical Height of Lightbox

I’m using pro & have tried to contact support but heard nothing so wondering if I can get help here. I’d like to adjust vertical height in the light box. When I adjust horizontal in settings, it does not adjust vertical. Horizontals just get smaller, vertical does not change in size. Example here. 1st image is horizontal & fine, second image is vertical and displays to large. http://christinepattersonfineart.com/portfolio_item/european-encaustic-series/

If anyone could offer suggestions would appreciate.

https://wordpress.org/plugins/easy-media-gallery/