res/xml/button_settings.xml

<?xml version="1.0" encoding="utf-8"?>
<!--  Copyright (C) 2017 The OmniROM Project

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 -->
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
        android:key="button_settings"
        android:title="@string/button_settings_title" >

    <PreferenceCategory
        android:key="button_other"
        android:title="@string/button_other_title" >

        <ListPreference
            android:key="navbar_recents_style"
            android:title="@string/navbar_recents_style_title"
            android:entries="@array/navbar_recents_style_entries"
            android:entryValues="@array/navbar_recents_style_values"
            android:persistent="false"/>

    </PreferenceCategory>

</PreferenceScreen>