react-test/docs/data/material/customization/right-to-left/RtlDemo.tsx

import { createTheme, ThemeProvider, Theme } from '@mui/material/styles';
import TextField from '@mui/material/TextField';
import rtlPlugin from '@mui/stylis-plugin-rtl';
import { prefixer } from 'stylis';
import { CacheProvider } from '@emotion/react';
import createCache from '@emotion/cache';

// Consuming the outer theme is only required with coexisting themes, like in this documentation.
// If your app/website doesn't deal with this, you can have just:
// const theme = createTheme({ direction: 'rtl' })
const theme = (outerTheme: Theme) =>
  createTheme({
    direction: 'rtl',
    palette: {
      mode: outerTheme.palette.mode,
    },
  });

const cacheRtl = createCache({
  key: 'muirtl',
  stylisPlugins: [prefixer, rtlPlugin],
});

export default function RtlDemo() {
  return (
    <CacheProvider value={cacheRtl}>
      <ThemeProvider theme={theme}>
        <div dir="rtl">
          <TextField
            label="ملصق"
            placeholder="العنصر النائب"
            helperText="هذا نص مساعد"
            variant="outlined"
          />
        </div>
      </ThemeProvider>
    </CacheProvider>
  );
}