Widened Jetpack gallery

Hello, I currently have a Jet-pack gallery set as "tiled mosaic". I like the arrangements of the photos but the gallery displayed on the post is a little too narrow for my taste. I tried setting the gallery to "Large" but nothing seem to happen. Is there a way to widen a jet-pack gallery on a page? Actually, I like how wide the Fotographie demo page has it. And it looks like a jetpack gallery, too. Is there a way to widened my gallery as wide as the Fotographie demo page has it? My URL is: https://laureanomodernphotography.com/ Thank You!