7.1 Gallery Carousel - how to change the number of thumbnails that display

Site URL: https://iris-mackerel-3dys.squarespace.com/residents

Hey team, 

I'm using a Gallery Carousel block (SS 7.1 Fluid Engine) and the default number of thumbnails that display before you start to scroll seems to be 3. 

However, I want to just show two larger thumbnails before you scroll through the images. Any idea how to achieve this. 

Here's my page: 
https://iris-mackerel-3dys.squarespace.com/residents
password: theware

Attached is a screenshot of how it looks, and how I want it to look. 

Many thanks

If I'm right, you just need to make the gallery block taller by dragging the bottom handle down. The images are sized based on the height of the block, so this may not work perfectly, but this is inherent to the type of gallery you're using.