Is it possible to override material-ui components default props?

The documentation for this is here: https://material-ui.com/customization/globals/#default-props

Here is an example of how to do this in v4 (v5 example further down):

import React from "react";
import ReactDOM from "react-dom";

import {createMuiTheme, MuiThemeProvider, Button} from "@material-ui/core";

const theme = createMuiTheme({
  props: {
    MuiButton: {
      variant: "contained",
      color: "secondary"
    }
  }
});
function App() {
  return (
    <MuiThemeProvider theme={theme}>
      <Button>Props defaulted</Button>
    </MuiThemeProvider>
  );
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);

---

Here's a similar example, but with the theme structure for v5 of Material-UI:

import React from "react";
import ReactDOM from "react-dom";

import Button from "@mui/material/Button";
import { createTheme, ThemeProvider } from "@mui/material/styles";

const theme = createTheme({
  components: {
    MuiButton: {
      defaultProps: {
        variant: "contained",
        color: "secondary"
      }
    }
  }
});
function App() {
  return (
    <ThemeProvider theme={theme}>
      <Button>Props defaulted</Button>
    </ThemeProvider>
  );
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);