[Plugin: NextGEN Gallery] Can the image size in the Image Browser be changed?

I’m testing out the NextGEN gallery and it looks pretty good for what I want. I like the imagebrowser feature and can see it at the bottom of blog entries related to the content.

I was wondering if it was possible to control the maximum dimensions of the image shown? It seems to set the pics to max width of the area available. This is fine for landscape photos, but looks awful (and takes up too much vertical realestate) with portrait photos. Can the max vertical size be set anywhere?