packages/SystemUI/res/layout/controls_management.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2019 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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/controls_management_root"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:paddingTop="@dimen/controls_management_top_padding"
    android:paddingStart="@dimen/controls_management_side_padding"
    android:paddingEnd="@dimen/controls_management_side_padding" >


    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="@style/TextAppearance.Control.Management.Title"
        android:textAlignment="center" />

    <TextView
        android:id="@+id/subtitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/controls_management_titles_margin"
        android:textAppearance="@style/TextAppearance.Control.Management.Subtitle"
        android:textAlignment="center" />

    <ViewStub
        android:id="@+id/stub"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/controls_management_footer_height">

        <View
            android:layout_width="match_parent"
            android:layout_height="@dimen/controls_app_divider_height"
            android:layout_gravity="center_horizontal|top"
            android:background="?android:attr/listDivider" />

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:paddingHorizontal="@dimen/controls_management_footer_side_margin"
            android:paddingVertical="@dimen/controls_management_footer_top_margin" >

            <Button
                android:id="@+id/other_apps"
                android:visibility="gone"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:gravity="center_vertical"
                android:text="@string/controls_favorite_see_other_apps"
                style="@*android:style/Widget.DeviceDefault.Button.Borderless.Colored"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintStart_toStartOf="parent"/>

            <Button
                android:id="@+id/rearrange"
                android:visibility="gone"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:gravity="center_vertical"
                style="@*android:style/Widget.DeviceDefault.Button.Borderless.Colored"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintStart_toStartOf="parent"/>

            <Button
                android:id="@+id/addControls"
                android:visibility="gone"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:gravity="center_vertical"
                android:text="@string/controls_favorite_add_controls"
                style="@*android:style/Widget.DeviceDefault.Button.Borderless.Colored"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintStart_toStartOf="parent"/>

            <Button
                android:id="@+id/done"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:text="@string/save"
                style="@*android:style/Widget.DeviceDefault.Button.Colored"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"/>
        </androidx.constraintlayout.widget.ConstraintLayout>
    </FrameLayout>


</LinearLayout>