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Showing content from https://github.com/microsoft/react-native-windows/issues/7560 below:

Bottom tab navigation doesn´t change text colour when selected · Issue #7560 · microsoft/react-native-windows · GitHub

Run the following in your terminal and copy the results here.

1. npx react-native --version: 5.0.1-alpha.2
2. npx react-native info:

System:
    OS: Windows 10 10.0.19042
    CPU: (8) x64 Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz
    Memory: 5.10 GB / 15.76 GB
  Binaries:
    Node: 14.16.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.5 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
    npm: 6.14.11 - C:\Program Files\nodejs\npm.CMD
    Watchman: Not Found
  SDKs:
    Android SDK:
      API Levels: 28, 29, 30
      Build Tools: 28.0.3, 29.0.2, 30.0.2
      System Images: android-28 | Google APIs Intel x86 Atom, android-29 | Intel x86 Atom, android-29 | Google APIs Intel x86 Atom, android-30 | Google APIs Intel x86 Atom, android-30 | Google Play Intel x86 Atom
      Android NDK: Not Found
    Windows SDK:
      AllowDevelopmentWithoutDevLicense: Enabled
      AllowAllTrustedApps: Enabled
      Versions: 10.0.18362.0, 10.0.19041.0
  IDEs:
    Android Studio: Version  4.1.0.0 AI-201.8743.12.41.7042882
    Visual Studio: 16.8.31019.35 (Visual Studio Community 2019)
  Languages:
    Java: 1.8.0_211 - C:\Program Files\Java\jdk1.8.0_211\bin\javac.EXE
  npmPackages:
    @react-native-community/cli: Not Found
    react: 17.0.1 => 17.0.1
    react-native: 0.64.0 => 0.64.0
    react-native-windows: ^0.64.0-0 => 0.64.3
  npmGlobalPackages:
    *react-native*: Not Found

• Target Platform Version(s): 10.0.18362.0
• Target Device(s): Desktop
• Visual Studio Version: vscode
• Build Configuration: Debug

Provide a detailed list of steps that reproduce the issue.

1. Create new app using latest version and typescript running:
   npx react-native init MyTSApp --template react-native-template-typescript cd MyTSApp
2. Move to folder with cd MyTsApp and run npx react-native-windows-init --overwrite --language cs
3. Install react-navigation and needed dependencies for it. See zip file for package.json.
4. Update App.tsx with a basic app with 2 screens. See zip file for App.tsx.
5. yarn android. See in the image below that Home is in blue.
6. yarn windows. See image below and notice that Home is still in black even if it´s the active Screen.

We expect that the bottom tab for the active Screen displays in blue.

Screenshot of how Android app displays in the Emulator:

Screenshot of how Windows app displays in the Emulator:

Package.json

{
  "name": "tabbedtsapp",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "android": "react-native run-android",
    "ios": "react-native run-ios",
    "start": "react-native start",
    "test": "jest",
    "lint": "eslint . --ext .js,.jsx,.ts,.tsx",
    "windows": "react-native run-windows"
  },
  "dependencies": {
    "@react-native-community/masked-view": "^0.1.10",
    "@react-navigation/bottom-tabs": "^5.11.9",
    "@react-navigation/native": "^5.9.4",
    "@react-navigation/stack": "^5.14.4",
    "react": "17.0.1",
    "react-native": "0.64.0",
    "react-native-gesture-handler": "^1.10.3",
    "react-native-reanimated": "^2.1.0",
    "react-native-safe-area-context": "^3.2.0",
    "react-native-screens": "^2.18.1",
    "react-native-windows": "^0.64.0-0"
  },
  "devDependencies": {
    "@babel/core": "^7.12.9",
    "@babel/runtime": "^7.12.5",
    "@react-native-community/eslint-config": "^2.0.0",
    "@types/jest": "^26.0.20",
    "@types/react-native": "^0.64.0",
    "@types/react-test-renderer": "^16.9.2",
    "babel-jest": "^26.6.3",
    "eslint": "^7.14.0",
    "jest": "^26.6.3",
    "metro-react-native-babel-preset": "^0.64.0",
    "react-test-renderer": "17.0.1",
    "typescript": "^3.8.3"
  },
  "resolutions": {
    "@types/react": "^17"
  },
  "jest": {
    "preset": "react-native",
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js",
      "jsx",
      "json",
      "node"
    ]
  }
}

App.tsx

import * as React from 'react';
import { Text, View } from 'react-native';
import { NavigationContainer } from '@react-navigation/native';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';

function HomeScreen() {
  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text>Home!</Text>
    </View>
  );
}

function SettingsScreen() {
  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text>Settings!</Text>
    </View>
  );
}

const Tab = createBottomTabNavigator();

export default function App() {
  return (
    <NavigationContainer>
      <Tab.Navigator>
        <Tab.Screen name="Home" component={HomeScreen} />
        <Tab.Screen name="Settings" component={SettingsScreen} />
      </Tab.Navigator>
    </NavigationContainer>
  );
}

TabbedTSApp.zip

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