Two blocks - green and red - have sizes indicated.
However, these two boxes are completely hidden. An error is made - the size of the parent component is not specified.
Fix the error. The parent component should fill the entire screen.

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App.js

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

export default function App() {
  return (
    <View>
      <View style={{ backgroundColor: "green", flex: 1 }} />
      <View style={{ backgroundColor: "red", flex: 2 }} />
    </View>
  );
}

app.json

{
  "expo": {
    "name": "1",
    "slug": "1",
    "version": "1.0.0",
    "orientation": "portrait",
    "icon": "./assets/icon.png",
    "splash": {
      "image": "./assets/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#ffffff"
    },
    "updates": {
      "fallbackToCacheTimeout": 0
    },
    "assetBundlePatterns": [
      "**/*"
    ],
    "ios": {
      "supportsTablet": true
    },
    "android": {
      "adaptiveIcon": {
        "foregroundImage": "./assets/adaptive-icon.png",
        "backgroundColor": "#FFFFFF"
      }
    },
    "web": {
      "favicon": "./assets/favicon.png"
    }
  }
}