Selected 3

import 'package:flutter/material.dart';

bool isOnNotif = false;

ListTile(
  leading: const Icon(
    Icons.notifications_active_outlined,
    color: Colors.deepPurple,
  ),
  title: const Text(
    'Notification',
    style: TextStyle(
      fontWeight: FontWeight.w400,
      fontSize: 14,
    ),
  ),
  subtitle: const Text(
    'Turn on to get reminder',
    style: TextStyle(
      fontWeight: FontWeight.w400,
      fontSize: 14,
    ),
  ),
  trailing: Switch(
    value: isOnNotif,
    onChanged: (value) {
      isOnNotif = !isOnNotif;
      setState(() {});
    },
  ),
),