Added sample project for testing

src/MauiSettings.Example/App.xaml

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+<?xml version = "1.0" encoding = "UTF-8" ?>
+<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:local="clr-namespace:MauiSettings.Example"
+             x:Class="MauiSettings.Example.App">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="Resources/Styles/Colors.xaml" />
+                <ResourceDictionary Source="Resources/Styles/Styles.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

src/MauiSettings.Example/App.xaml.cs

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+using AndreasReitberger.Shared.Core.Utilities;
+using MauiSettings.Example.Models.Settings;
+
+namespace MauiSettings.Example
+{
+    public partial class App : Application
+    {
+        public static string Hash = "96ug+F5VbYkQjqyolK8SO/R/HHeBZ2srDfMRR7uwrKA=";
+        public App()
+        {
+            InitializeComponent();
+            // Example of how to generate a new key
+            //string t = EncryptionManager.GenerateBase64Key();
+            SettingsApp.LoadSettings(Hash);
+            // Needed in order to load only the secure settings (for instance the license)
+            Dispatcher.DispatchAsync(async() => await SettingsApp.LoadSecureSettingsAsync(Hash));
+
+            MainPage = new AppShell();
+        }
+
+        protected override void OnSleep()
+        {
+            base.OnSleep();
+            if (SettingsApp.SettingsChanged)
+            {
+                try
+                {
+                    SettingsApp.SaveSettings(Hash);
+                }
+                catch (Exception)
+                {
+
+                }
+            }
+        }
+    }
+}

src/MauiSettings.Example/AppShell.xaml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<Shell
+    x:Class="MauiSettings.Example.AppShell"
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    xmlns:local="clr-namespace:MauiSettings.Example"
+    Shell.FlyoutBehavior="Disabled"
+    Title="MauiSettings.Example">
+
+    <ShellContent
+        Title="Home"
+        ContentTemplate="{DataTemplate local:MainPage}"
+        Route="MainPage" />
+
+</Shell>

src/MauiSettings.Example/AppShell.xaml.cs

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+namespace MauiSettings.Example
+{
+    public partial class AppShell : Shell
+    {
+        public AppShell()
+        {
+            InitializeComponent();
+        }
+    }
+}

src/MauiSettings.Example/MainPage.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    x:Class="MauiSettings.Example.MainPage"
+    xmlns:viewModels="clr-namespace:MauiSettings.Example.ViewModels"
+
+    x:DataType="viewModels:MainPageViewModel"
+    >
+
+    <ScrollView>
+        <VerticalStackLayout
+            Padding="30,0"
+            Spacing="25">
+            <Label
+                Text="License"
+                Style="{StaticResource Headline}"
+                SemanticProperties.HeadingLevel="Level1" />
+
+            <Editor
+                Text="{Binding LicenseInfo}"
+                />
+
+            <Button
+                x:Name="SaveBtn"
+                Text="Save Settings"
+                Command="{Binding SaveSettingsCommand}"
+                HorizontalOptions="Fill" />
+
+            <Button
+                x:Name="ExportBtn"
+                Text="To dictionary"
+                Command="{Binding ToDictionaryCommand}"
+                HorizontalOptions="Fill" />
+        </VerticalStackLayout>
+    </ScrollView>
+
+</ContentPage>

src/MauiSettings.Example/MainPage.xaml.cs

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+using MauiSettings.Example.ViewModels;
+
+namespace MauiSettings.Example
+{
+    public partial class MainPage : ContentPage
+    {
+        public MainPage()
+        {
+            InitializeComponent();
+            BindingContext = new MainPageViewModel();
+        }
+    }
+
+}

src/MauiSettings.Example/MauiProgram.cs

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+using Microsoft.Extensions.Logging;
+
+namespace MauiSettings.Example
+{
+    public static class MauiProgram
+    {
+        public static MauiApp CreateMauiApp()
+        {
+            var builder = MauiApp.CreateBuilder();
+            builder
+                .UseMauiApp<App>()
+                .ConfigureFonts(fonts =>
+                {
+                    fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
+                    fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
+                });
+
+#if DEBUG
+    		builder.Logging.AddDebug();
+#endif
+            builder.Services.AddSingleton(Dispatcher.GetForCurrentThread());
+            return builder.Build();
+        }
+    }
+}

src/MauiSettings.Example/MauiSettings.Example.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+	<PropertyGroup>
+		<TargetFrameworks>net8.0-android;net8.0-ios;net8.0-maccatalyst</TargetFrameworks>
+		<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net8.0-windows10.0.19041.0</TargetFrameworks>
+		<!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
+		<!-- <TargetFrameworks>$(TargetFrameworks);net8.0-tizen</TargetFrameworks> -->
+
+		<!-- Note for MacCatalyst:
+		The default runtime is maccatalyst-x64, except in Release config, in which case the default is maccatalyst-x64;maccatalyst-arm64.
+		When specifying both architectures, use the plural <RuntimeIdentifiers> instead of the singular <RuntimeIdentifier>.
+		The Mac App Store will NOT accept apps with ONLY maccatalyst-arm64 indicated;
+		either BOTH runtimes must be indicated or ONLY macatalyst-x64. -->
+		<!-- For example: <RuntimeIdentifiers>maccatalyst-x64;maccatalyst-arm64</RuntimeIdentifiers> -->
+
+		<OutputType>Exe</OutputType>
+		<RootNamespace>MauiSettings.Example</RootNamespace>
+		<UseMaui>true</UseMaui>
+		<SingleProject>true</SingleProject>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<Nullable>enable</Nullable>
+
+		<!-- Display name -->
+		<ApplicationTitle>MauiSettings Example</ApplicationTitle>
+
+		<!-- App Identifier -->
+		<ApplicationId>com.companyname.mauisettingsexample</ApplicationId>
+
+		<!-- Versions -->
+		<ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
+		<ApplicationVersion>1</ApplicationVersion>
+
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">11.0</SupportedOSPlatformVersion>
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">13.1</SupportedOSPlatformVersion>
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">21.0</SupportedOSPlatformVersion>
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</SupportedOSPlatformVersion>
+		<TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</TargetPlatformMinVersion>
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>
+	</PropertyGroup>
+
+	<ItemGroup>
+		<!-- App Icon -->
+		<MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />
+
+		<!-- Splash Screen -->
+		<MauiSplashScreen Include="Resources\Splash\splash.svg" Color="#512BD4" BaseSize="128,128" />
+
+		<!-- Images -->
+		<MauiImage Include="Resources\Images\*" />
+		<MauiImage Update="Resources\Images\dotnet_bot.png" Resize="True" BaseSize="300,185" />
+
+		<!-- Custom Fonts -->
+		<MauiFont Include="Resources\Fonts\*" />
+
+		<!-- Raw Assets (also remove the "Resources\Raw" prefix) -->
+		<MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
+	</ItemGroup>
+
+	<ItemGroup>
+		<PackageReference Include="Microsoft.Maui.Controls" Version="8.0.10" />
+		<PackageReference Include="Microsoft.Maui.Controls.Compatibility" Version="8.0.10" />
+		<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="8.0.0" />
+	</ItemGroup>
+
+	<ItemGroup>
+	  <ProjectReference Include="..\MauiSettings\MauiSettings.csproj" />
+	</ItemGroup>
+
+</Project>

src/MauiSettings.Example/Models/Settings/SettingsApp.cs

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+using AndreasReitberger.Maui;
+using AndreasReitberger.Maui.Attributes;
+using System.Runtime.CompilerServices;
+
+namespace MauiSettings.Example.Models.Settings
+{
+    /// <summary>
+    /// Holds the whole local application settings
+    /// </summary>
+    public partial class SettingsApp : MauiSettings<SettingsApp>
+    {
+        #region Properties
+        static bool _settingsChanged = false;
+        public static bool SettingsChanged
+        {
+            get => _settingsChanged;
+            set
+            {
+                if (_settingsChanged == value) return;
+                _settingsChanged = value;
+            }
+        }
+        #endregion
+
+        #region DeviceSettings
+        /// <summary>
+        /// Opens the settings UI on the current device
+        /// </summary>
+        public static void OpenDeviceSettings()
+        {
+            AppInfo.ShowSettingsUI();
+        }
+        #endregion
+
+        #region Settings
+
+        #region Version
+        [MauiSetting(Name = nameof(App_SettingsVersion), DefaultValue = "1.0.0", SkipForExport = true)]
+        public static Version App_SettingsVersion { get; set; }
+
+        #endregion
+
+        #region Default
+
+        [MauiSetting(Name = nameof(License_AcceptEndUserLicenseAgreement), DefaultValue = false)]
+        public static bool License_AcceptEndUserLicenseAgreement { get; set; }
+
+        [MauiSetting(Name = nameof(License_ProUpgradePurchased), DefaultValue = false)]
+        public static bool License_ProUpgradePurchased { get; set; }
+
+        [MauiSetting(Name = nameof(LicenseInfo), DefaultValue = "", Secure = true, Encrypt = true)]
+        public static string LicenseInfo { get; set; } = string.Empty;
+        #endregion
+
+        #region Privacy
+        [MauiSetting(Name = nameof(Privacy_AcceptPrivacyPolicy), DefaultValue = false, SkipForExport = true)]
+        public static bool Privacy_AcceptPrivacyPolicy { get; set; }
+
+        #endregion
+
+        #endregion
+
+        #region Methods
+
+        /// <summary>
+        /// Creates a copy of the current <c>SettingsApp</c>
+        /// </summary>
+        /// <returns>Copy of the current <c>SettingsApp</c></returns>
+        public static SettingsApp Copy()
+        {
+            SettingsApp app = new();
+            app.LoadObjectSettings();
+            return app;
+        }
+
+        #endregion
+    }
+}

src/MauiSettings.Example/Platforms/Android/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+	<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true"></application>
+	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+	<uses-permission android:name="android.permission.INTERNET" />
+</manifest>

src/MauiSettings.Example/Platforms/Android/MainActivity.cs

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+using Android.App;
+using Android.Content.PM;
+using Android.OS;
+
+namespace MauiSettings.Example
+{
+    [Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]
+    public class MainActivity : MauiAppCompatActivity
+    {
+    }
+}

src/MauiSettings.Example/Platforms/Android/MainApplication.cs

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+using Android.App;
+using Android.Runtime;
+
+namespace MauiSettings.Example
+{
+    [Application]
+    public class MainApplication : MauiApplication
+    {
+        public MainApplication(IntPtr handle, JniHandleOwnership ownership)
+            : base(handle, ownership)
+        {
+        }
+
+        protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+    }
+}

src/MauiSettings.Example/Platforms/Android/Resources/values/colors.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#512BD4</color>
+    <color name="colorPrimaryDark">#2B0B98</color>
+    <color name="colorAccent">#2B0B98</color>
+</resources>

src/MauiSettings.Example/Platforms/MacCatalyst/AppDelegate.cs

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+using Foundation;
+
+namespace MauiSettings.Example
+{
+    [Register("AppDelegate")]
+    public class AppDelegate : MauiUIApplicationDelegate
+    {
+        protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+    }
+}

src/MauiSettings.Example/Platforms/MacCatalyst/Entitlements.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+    <!-- See https://aka.ms/maui-publish-app-store#add-entitlements for more information about adding entitlements.-->
+    <dict>
+        <!-- App Sandbox must be enabled to distribute a MacCatalyst app through the Mac App Store. -->
+        <key>com.apple.security.app-sandbox</key>
+        <true/>
+        <!-- When App Sandbox is enabled, this value is required to open outgoing network connections. -->
+        <key>com.apple.security.network.client</key>
+        <true/>
+    </dict>
+</plist>
+