Gadgetbridge/app/src/main/res/xml/charts_preferences.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <!-- this only shows up when a device is set
    <com.mobeta.android.dslv.DragSortListPreference
        android:icon="@drawable/ic_tabs"
        android:defaultValue="@array/pref_charts_tabs_items_default"
        android:dialogTitle="@string/prefs_charts_tabs"
        android:entries="@array/pref_charts_tabs_items"
        android:entryValues="@array/pref_charts_tabs_values"
        android:key="charts_tabs"
        android:persistent="false"
        android:summary="@string/prefs_charts_tabs_summary"
        android:title="@string/prefs_charts_tabs" />-->

    <PreferenceCategory
        android:key="pref_charts"
        android:title="@string/activity_prefs_charts"
        app:iconSpaceReserved="false">

        <EditTextPreference
            android:defaultValue="250"
            android:inputType="number"
            android:key="chart_max_heart_rate"
            android:maxLength="3"
            android:title="@string/activity_prefs_chart_max_heart_rate"
            app:iconSpaceReserved="false"
            app:useSimpleSummaryProvider="true" />

        <EditTextPreference
            android:defaultValue="10"
            android:inputType="number"
            android:key="chart_min_heart_rate"
            android:maxLength="3"
            android:title="@string/activity_prefs_chart_min_heart_rate"
            app:iconSpaceReserved="false"
            app:useSimpleSummaryProvider="true" />

        <SwitchPreferenceCompat
            android:defaultValue="false"
            android:key="chart_heartrate_color"
            android:layout="@layout/preference_checkbox"
            android:summaryOff="@string/pref_chart_heartrate_color_orange"
            android:summaryOn="@string/pref_chart_heartrate_color_red"
            android:title="@string/pref_title_chart_heartrate_color"
            app:iconSpaceReserved="false" />

        <SwitchPreferenceCompat
            android:defaultValue="true"
            android:key="charts_allow_swipe"
            android:layout="@layout/preference_checkbox"
            android:title="@string/pref_title_charts_swipe"
            app:iconSpaceReserved="false" />

        <SwitchPreferenceCompat
            android:defaultValue="false"
            android:key="chart_sleep_range_24h"
            android:layout="@layout/preference_checkbox"
            android:summaryOff="@string/pref_chart_sleep_rolling_24_off"
            android:summaryOn="@string/pref_chart_sleep_rolling_24_on"
            android:title="@string/pref_title_chart_sleep_rolling_24_hour"
            app:iconSpaceReserved="false" />

        <SwitchPreferenceCompat
            android:defaultValue="true"
            android:key="charts_show_average"
            android:layout="@layout/preference_checkbox"
            android:title="@string/pref_title_charts_average"
            app:iconSpaceReserved="false" />

        <SwitchPreferenceCompat
            android:defaultValue="false"
            android:key="charts_range"
            android:layout="@layout/preference_checkbox"
            android:summaryOff="@string/pref_charts_range_off"
            android:summaryOn="@string/pref_charts_range_on"
            android:title="@string/pref_title_charts_range"
            app:iconSpaceReserved="false" />

        <SwitchPreferenceCompat
            android:defaultValue="true"
            android:key="charts_show_ongoing_activity"
            android:layout="@layout/preference_checkbox"
            android:title="@string/show_ongoing_activity"
            app:iconSpaceReserved="false" />

        <EditTextPreference
            android:defaultValue="6"
            android:inputType="number"
            android:key="chart_sleep_lines_limit"
            android:maxLength="2"
            android:title="@string/pref_chart_sleep_lines_limit"
            app:iconSpaceReserved="false"
            app:useSimpleSummaryProvider="true" />

    </PreferenceCategory>

    <PreferenceCategory
        android:key="pref_charts_activity_list"
        android:title="@string/charts_activity_list"
        app:iconSpaceReserved="false">

        <EditTextPreference
            android:defaultValue="5"
            android:inputType="number"
            android:key="chart_list_min_session_length"
            android:maxLength="2"
            android:title="@string/activity_prefs_chart_min_session_length"
            app:iconSpaceReserved="false"
            app:useSimpleSummaryProvider="true" />

        <EditTextPreference
            android:defaultValue="5"
            android:inputType="number"
            android:key="chart_list_max_idle_phase_length"
            android:maxLength="2"
            android:title="@string/activity_prefs_chart_max_idle_phase_length"
            app:iconSpaceReserved="false"
            app:useSimpleSummaryProvider="true" />

        <EditTextPreference
            android:defaultValue="20"
            android:inputType="number"
            android:key="chart_list_min_steps_per_minute"
            android:maxLength="3"
            android:title="@string/activity_prefs_chart_min_steps_per_minute"
            app:iconSpaceReserved="false"
            app:useSimpleSummaryProvider="true" />

        <EditTextPreference
            android:defaultValue="120"
            android:inputType="number"
            android:key="chart_list_min_steps_per_minute_for_run"
            android:maxLength="3"
            android:title="@string/activity_prefs_chart_min_steps_per_minute_for_run"
            app:iconSpaceReserved="false"
            app:useSimpleSummaryProvider="true" />
    </PreferenceCategory>

    <PreferenceCategory
        android:key="pref_category_activity_personal_title"
        android:title="@string/activity_prefs_about_you"
        app:iconSpaceReserved="false">

        <Preference
            android:key="pref_category_activity_personal"
            android:title="@string/activity_prefs_about_you"
            app:iconSpaceReserved="false" />
    </PreferenceCategory>
</PreferenceScreen>