You mean an Accordion, right? - https://mui.com/material-ui/react-accordion/

> keep the nice Admonitions feature

What kind of "nice feature" are you talking about? If you are talking about the syntax, you can use the same admonition syntax but provide your own admonition theme implementation, as instructed here: https://docusaurus.io/docs/markdown-features/react#mdx-component-scope If you want the "note" color, you can swizzle and render different color/icons based on a prop.