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The following XML should lock the screen to portrait
<style name="Theme.Normal" parent="android:Theme">
If use this theme in an app and turn the device to landscape, the app turns to landscape.
However, ScreenOrientation = Android.Content.PM.ScreenOrientation.Portrait will lock to portrait
The same behavior occurs when using Java and Android Studio. I am closing this bug as invalid, as it is not specific to Xamarin.Android