From the release notes:

We are happy to release the new version of ratatui mouse, a community-maintained fork of tui.

In this version, we have introduced a new Scrollbar widget and enhanced the functionality of existing widgets like Block and Barchart. We have also made significant improvements to the stylization/widgets API, ensuring a smoother experience when creating TUIs. Additionally, we have addressed various bugs and implemented enhancements to optimize the overall user experience in TUI development.

Here is a blog post highlighting the prominent new features and providing practical examples of their usage: https://blog.orhun.dev/ratatui-0-22-0