The site is wild, but the little triangles in the bottom right corners of each window don't work properly on chrome desktop in windows 11. They aren't clickable, you can only resize the windows horizontally. Which seems weird considering how polished the rest of it looks.

it doesn’t look immediate mode to me?

It presumably powers OpenCode, the agent harness.

The website for https://www.egui.rs sort of sucks, it took around 10 seconds to load and initialize for some reason.