Simple-Calendar/app/src/main/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest
    package="com.simplemobiletools.calendar"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>

        <activity
            android:name=".MyWidgetConfigure"
            android:screenOrientation="portrait"
            android:theme="@style/MyWidgetConfigTheme">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_CONFIGURE"/>
            </intent-filter>
        </activity>

        <activity
            android:name=".AboutActivity"
            android:label="@string/about"
            android:screenOrientation="portrait"/>

        <activity
            android:name=".LicenseActivity"
            android:label="@string/third_party_licences"
            android:screenOrientation="portrait"/>

        <receiver
            android:name=".MyWidgetProvider">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
            </intent-filter>

            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/widget_info"/>
        </receiver>

    </application>

</manifest>