Hi Badgerwatcher,
Not quite sure where you're looking when you only see the filmstrip, but if you click on a category from the gallery's frontpage you should get a page like this one for caterpillars -
http://www.wildaboutbritain.co.uk/ga...23-albums.html
Above the images their should be something like a '30 images per page' link, you can clikc on this to select more images to show per page in this category.
Stu