How to make a React Native app portrait only?

To make a React Native app portrait only, we change our app’s manifest.xml.

For instance, we write

<activity
  android:name=".MainActivity"
  android:configChanges="orientation"
  android:screenOrientation="portrait"
>
  ...
</activity>

to set android:configChanges to orientation to change the orientation of our app.

And we set android:screenOrientation to portrait to keep the app in portrait mode.