keepass2android/src/keepass2android-app/Resources/layout/preference.axml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

  <FrameLayout
    android:id="@+id/settings"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />
</LinearLayout>