Settings/res-twopanel/layout/leanback_preference_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2020 The Android Open Source Project
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~      http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License
  -->

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:id="@+id/main_frame"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:background="?android:attr/windowBackground"
              android:orientation="vertical"
              android:transitionGroup="false">

    <FrameLayout
        android:id="@+id/decor_title_container"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="5dp"
        android:background="@color/tp_preference_brand_color"
        android:elevation="@dimen/lb_preference_decor_title_container_elevation"
        android:transitionGroup="false">
        <TextView
            android:id="@+id/decor_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            style="?android:attr/titleTextStyle"
            android:includeFontPadding="true"
            android:layout_marginBottom="@dimen/tp_preference_decor_title_margin_bottom"
            android:singleLine="false"
            android:autoSizeTextType="uniform"
            android:maxLines="3"/>
    </FrameLayout>

</LinearLayout>