Version #1 - Slider Mode ON
Version #2 - Slider Mode OFF - Preview Thumbnails is Bigger and Big Image shows in Full-Screen.
Block with 300x250 banner and Thumbnails moves right on Desktop Devices, and moves down on Mobiles. You can add more banners there, or remove the banners. Also you can remove all block - then Gallery Block just stretch to Full-Site Width on Desktop Devices.
Buy the way - this text as description example with paragraphs and colorized words. You can remove it.