How to make button expand area like Sparkle 5 page?

On Sparkleʻs website on the Sparkle 5 page, at the very bottom there are buttons that expand when pressed for Sparkle version 4, 3, 2, etc. How do we make those so when pressed the area expands? Using Sparkle 5.2.5.

That’s done using layout blocks, the documentation mentions it, and we also made a tutorial about it:


@duncan Thank you for the help. Video was excellent and very helpful!