React Native View and Flex: 1 not working as expected - reactjs

Question

I learning React Native and I'm doing a simple View and setting the style to a container style, but nothing happens when I run the code. The View is now filling with the color read from the code. Its very starter code, just not seeing where its going wrong? When I run this, nothing in the view changes, it just white? I was expecting to see a screen of red?
import React, { useState } from 'react';
import {View, Text, StyleSheet, ScrollView} from 'react-native';
import { Input } from 'react-native-elements';
import SLSHeader from '../app-components/slsheader';
export default function Home (props) {
return (
<View styles={styles.container}>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: 'red'
}
});

Answer 1

The only place Im using it thus far is in a Navigator file... Its a switch Navigator with a Drawer Navigator...
import React from 'react';
import { createAppContainer, createSwitchNavigator} from 'react-navigation';
import { createDrawerNavigator } from 'react-navigation-drawer';
//import CustomDrawer from './CustomDrawer';
//Import Screens
import LoginScreen from '../screens/Login';
import HomeScreen from '../screens/Home';
//Drawer Screens
const DrawerScreens = {
Home: {
screen: HomeScreen,
navigationOptions:{
headerShown: false
}
}
}
const DrawerNavigator = createDrawerNavigator(DrawerScreens, {
defaultNavigationOptions: {
headerStyle: {
height: 60
}
},
//contentComponent: CustomDrawer
});
//Pre Login Screens
const PreLoginScreens = {
Login: {
screen: LoginScreen,
navigationOptions:{
headerShown: false
}
},
PostLogin: {
screen: DrawerNavigator
}
}
const PreloginNavigator = createSwitchNavigator(PreLoginScreens,{
defaultNavigationOptions: {}
});
export default createAppContainer(PreloginNavigator);

Answer 2

Yes, in the App.js
import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import SLSNavigator from './Navigation/SLSNavigator';
export default function App() {
return (
<SLSNavigator />
);
}