Conversations/src/main/res/layout-w945dp/activity_conversations.xml

<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal">

        <FrameLayout
            android:id="@+id/main_fragment"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1000"/>

        <FrameLayout
            android:id="@+id/secondary_fragment"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1618"/>

    </LinearLayout>

</layout>