callstack__react-native-testing-library/examples/cookbook/app/_layout.tsx

import { Stack } from 'expo-router';
import * as React from 'react';

import theme from '../theme';

export default function RootLayout() {
  return (
    <Stack
      screenOptions={{
        headerStyle: {
          backgroundColor: theme.colors.primary,
        },
        headerTintColor: '#fff',
        headerTitleStyle: {
          fontWeight: 'bold',
        },
      }}
    >
      <Stack.Screen name="index" options={{ headerTitle: '' }} />
    </Stack>
  );
}