Catch Gallery – how to get tiled mosaic?

Hi all, Been tinkering with catch gallery for a bit and can't seem to get it to work. I created a new page, went to media, added a gallery, and upload 265 (I know, a lot, but they're optimized) photos to it. However, when I went to preview the page, they all came up as thumbnails, and I couldn't click into them to view them larger. How do I get it to a place where it looks like this? https://catchthemes.com/demo/simple-persona/style-guide/gallery/ I know the above was made with the Jetpack Tile Gallery, but I was under the assumption that Catch Gallery did the same. Thank you in advance.