app/src/main/res/xml/preference_fragment_settings_main.xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:app="http://schemas.android.com/apk/res-auto">
<Preference
app:fragment="io.github.polysmee.settings.fragments.SettingsAppointmentsReminderFragment"
app:icon="@drawable/settings_reminder"
app:title="@string/title_settings_appointments_reminder" />
<SwitchPreference
app:key="@string/preference_key_is_dark_mode"
app:title="@string/dark_theme_text"/>
</PreferenceScreen>