Horizontal Scrolling - Can I change the section height?
Unfortunately the height of a Squarespace section cannot be change when using SquareKicker's Horizontal Scrolling tool.
For technical reasons it needs to be 100% viewport height, otherwise there will be blank white space until the last section comes into view. This is because Horizontal Scrolling uses an illusion of timing that determines when the sections come into view, rather than the sections actually being positioned side by side while scrolling.
If you're interested in understanding this more, click here to watch a video explaining how Horizontal Scrolling works (watch the first 30seconds).