MonoGame.Samples/Storage/Platforms/Android/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.yourcompany.storage"
    android:versionCode="1"
    android:versionName="1.0">
    <application android:label="Storage">
        <activity android:name="Storage.Platforms.Android.MainActivity"
            android:label="Storage"
            android:theme="@android:style/Theme.NoTitleBar"
            android:configChanges="keyboardHidden|orientation|screenSize"
            android:screenOrientation="landscape">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>