Change existing gallery in nextGEN

So everything is up to date with my versions of NextGEN and WP. All of my galleries in my website run as thumbnails where the person visiting my site can click on the thumbnail and see a bigger picture, except 1 gallery which shows up as a slideshow where you click to the right to view the next image. I can’t find where in the nextgen settings to alter the display of an existing gallery so that I can make them all uniform.

Please help,

Thanks.