Can also be done using useState in react. On clicking the button, the state changes, and depending on the state we show the textarea.

const [clicked, setClicked] = useState(false);
<Textarea
    placeholder="Add Your Note"
    className={`${clicked ? "visible": "collapse"}`}
  />
  <Button
    onClick={(e) => {
      setClicked(!clicked);
    }}
  >
    Add Note
  </Button>