#unitytips: SettingsProvider - http://diegogiacomelli.com.br/unitytips-settings-provider

FrameworkSettings.cs

using UnityEngine;

namespace Giacomelli.Framework
{
    public class FrameworkSettings : ScriptableObject
    {
        [SerializeField]
        bool _entityLogEnabled;

        [SerializeField]
        bool _notificationsLogEnabled;

        public static bool EntityLogEnabled { get; private set; }
        public static bool NotificationsLogEnabled { get; private set; }

        private void OnEnable()
        {
            Refresh(this);
        }

        public static void Refresh(FrameworkSettings instance)
        {
            EntityLogEnabled = instance._entityLogEnabled;
            NotificationsLogEnabled = instance._notificationsLogEnabled;
        }       
    }
}

FrameworkSettingsRegister.cs

using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

namespace Giacomelli.Framework
{
    public static class FrameworkSettingsRegister
    {
        const string SettingsPath = "Assets/Editor/Giacomelli.Framework.Settings.asset";

        [SettingsProvider]
        public static SettingsProvider CreateSettingsProvider()
        {
            var logFoldout = true;

            return new SettingsProvider("Project/Giacomelli.Framework", SettingsScope.Project)
            {
                guiHandler = (searchContext) =>
                {
                    var settings = Load();
                    var serialized = new SerializedObject(settings);

                    EditorGUI.BeginChangeCheck();

                    logFoldout = EditorGUILayout.BeginFoldoutHeaderGroup(logFoldout, "Logging");

                    if (logFoldout)
                    {
                        EditorGUILayout.PropertyField(serialized.FindProperty("_entityLogEnabled"), new GUIContent("Entity"));
                        EditorGUILayout.PropertyField(serialized.FindProperty("_notificationsLogEnabled"), new GUIContent("Notifications"));
                        EditorGUILayout.HelpBox("Those log messages will appear on console with the prefix [ENTITY] or [NOTIFICATIONS]", MessageType.Info);
                    }

                    EditorGUILayout.EndFoldoutHeaderGroup();

                    if (EditorGUI.EndChangeCheck())
                    {
                        serialized.ApplyModifiedProperties();
                        FrameworkSettings.Refresh(settings);
                    }                   
                },
                
                keywords = new HashSet<string>(new[] { "Entity log enabled", "Notifications log enabled" })
            };
        }

        static FrameworkSettings Load()
        {
            var settings = AssetDatabase.LoadAssetAtPath<FrameworkSettings>(SettingsPath);

            if (settings == null)
            {
                settings = ScriptableObject.CreateInstance<FrameworkSettings>();
                AssetDatabase.CreateAsset(settings, SettingsPath);
                AssetDatabase.SaveAssets();
            }

            return settings;
        }
    }
}