screens/CalendarScreen.js

import React from 'react';
import {StyleSheet, View} from 'react-native';

function CalendarScreen() {
  return <View style={styles.block} />;
}
const styles = StyleSheet.create({
  block: {},
});

export default CalendarScreen;

screens/SearchScreen.js

import React from 'react';
import {StyleSheet, View} from 'react-native';

function SearchScreen() {
  return <View style={styles.block} />;
}

const styles = StyleSheet.create({
  block: {},
});

export default SearchScreen;