Thanks! We built it custom because we needed some specific interactions. You can find the code here: https://github.com/appsmithorg/appsmith/tree/release/app/cli...

Library might be an overkill I guess. It is an absolute positioned element. There is a config for each step as to what to show at each step in the popup. The animation at the end makes use of https://github.com/airbnb/lottie-web