diff --git a/ElectronNET.API/Entities/BrowserWindowOptions.cs b/ElectronNET.API/Entities/BrowserWindowOptions.cs
index 863b133..c7263ae 100644
--- a/ElectronNET.API/Entities/BrowserWindowOptions.cs
+++ b/ElectronNET.API/Entities/BrowserWindowOptions.cs
@@ -37,62 +37,62 @@ namespace ElectronNET.API.Entities
         /// window's size will include window frame's size and be slightly larger. Default
         /// is false.
         /// </summary>
-        public bool UseContentSize { get; set; }
+        public bool? UseContentSize { get; set; }
 
         /// <summary>
         /// Show window in the center of the screen.
         /// </summary>
-        public bool Center { get; set; }
+        public bool? Center { get; set; }
 
         /// <summary>
         /// Window's minimum width. Default is 0.
         /// </summary>
-        public int MinWidth { get; set; }
+        public int? MinWidth { get; set; }
 
         /// <summary>
         /// Window's minimum height. Default is 0.
         /// </summary>
-        public int MinHeight { get; set; }
+        public int? MinHeight { get; set; }
 
         /// <summary>
         /// Window's maximum width. Default is no limit.
         /// </summary>
-        public int MaxWidth { get; set; }
+        public int? MaxWidth { get; set; }
 
         /// <summary>
         /// Window's maximum height. Default is no limit.
         /// </summary>
-        public int MaxHeight { get; set; }
+        public int? MaxHeight { get; set; }
 
         /// <summary>
         /// Whether window is resizable. Default is true.
         /// </summary>
         [DefaultValue(true)]
-        public bool Resizable { get; set; } = true;
+        public bool? Resizable { get; set; } = true;
 
         /// <summary>
         /// Whether window is movable. This is not implemented on Linux. Default is true.
         /// </summary>
         [DefaultValue(true)]
-        public bool Movable { get; set; } = true;
+        public bool? Movable { get; set; } = true;
 
         /// <summary>
         /// Whether window is minimizable. This is not implemented on Linux. Default is true.
         /// </summary>
         [DefaultValue(true)]
-        public bool Minimizable { get; set; } = true;
+        public bool? Minimizable { get; set; } = true;
 
         /// <summary>
         /// Whether window is maximizable. This is not implemented on Linux. Default is true.
         /// </summary>
         [DefaultValue(true)]
-        public bool Maximizable { get; set; } = true;
+        public bool? Maximizable { get; set; } = true;
 
         /// <summary>
         /// Whether window is closable. This is not implemented on Linux. Default is true.
         /// </summary>
         [DefaultValue(true)]
-        public bool Closable { get; set; } = true;
+        public bool? Closable { get; set; } = true;
 
         /// <summary>
         /// Whether the window can be focused. Default is true. On Windows setting
@@ -101,35 +101,35 @@ namespace ElectronNET.API.Entities
         /// always stay on top in all workspaces.
         /// </summary>
         [DefaultValue(true)]
-        public bool Focusable { get; set; } = true;
+        public bool? Focusable { get; set; } = true;
 
         /// <summary>
         /// Whether the window should always stay on top of other windows. Default is false.
         /// </summary>
-        public bool AlwaysOnTop { get; set; }
+        public bool? AlwaysOnTop { get; set; }
 
         /// <summary>
         /// Whether the window should show in fullscreen. When explicitly set to false the
         /// fullscreen button will be hidden or disabled on macOS.Default is false.
         /// </summary>
-        public bool Fullscreen { get; set; }
+        public bool? Fullscreen { get; set; }
 
         /// <summary>
         /// Whether the window can be put into fullscreen mode. On macOS, also whether the
         /// maximize/zoom button should toggle full screen mode or maximize window.Default
         /// is true.
         /// </summary>
-        public bool Fullscreenable { get; set; }
+        public bool? Fullscreenable { get; set; }
 
         /// <summary>
         /// Whether to show the window in taskbar. Default is false.
         /// </summary>
-        public bool SkipTaskbar { get; set; }
+        public bool? SkipTaskbar { get; set; }
 
         /// <summary>
         /// The kiosk mode. Default is false.
         /// </summary>
-        public bool Kiosk { get; set; }
+        public bool? Kiosk { get; set; }
 
         /// <summary>
         /// Default window title. Default is "Electron.NET".
@@ -146,40 +146,40 @@ namespace ElectronNET.API.Entities
         /// Whether window should be shown when created. Default is true.
         /// </summary>
         [DefaultValue(true)]
-        public bool Show { get; set; } = true;
+        public bool? Show { get; set; } = true;
 
         /// <summary>
         /// Specify false to create a . Default is true.
         /// </summary>
         [DefaultValue(true)]
-        public bool Frame { get; set; } = true;
+        public bool? Frame { get; set; } = true;
 
         /// <summary>
         /// Whether this is a modal window. This only works when the window is a child
         /// window.Default is false.
         /// </summary>
-        public bool Modal { get; set; }
+        public bool? Modal { get; set; }
 
         /// <summary>
         /// Whether the web view accepts a single mouse-down event that simultaneously
         /// activates the window.Default is false.
         /// </summary>
-        public bool AcceptFirstMouse { get; set; }
+        public bool? AcceptFirstMouse { get; set; }
 
         /// <summary>
         /// Whether to hide cursor when typing. Default is false.
         /// </summary>
-        public bool DisableAutoHideCursor { get; set; }
+        public bool? DisableAutoHideCursor { get; set; }
 
         /// <summary>
         /// Auto hide the menu bar unless the Alt key is pressed. Default is false.
         /// </summary>
-        public bool AutoHideMenuBar { get; set; }
+        public bool? AutoHideMenuBar { get; set; }
 
         /// <summary>
         /// Enable the window to be resized larger than screen. Default is false.
         /// </summary>
-        public bool EnableLargerThanScreen { get; set; }
+        public bool? EnableLargerThanScreen { get; set; }
 
         /// <summary>
         /// Window's background color as Hexadecimal value, like #66CD00 or #FFF or
@@ -191,18 +191,18 @@ namespace ElectronNET.API.Entities
         /// Whether window should have a shadow. This is only implemented on macOS. Default
         /// is true.
         /// </summary>
-        public bool HasShadow { get; set; }
+        public bool? HasShadow { get; set; }
 
         /// <summary>
         /// Forces using dark theme for the window, only works on some GTK+3 desktop
         /// environments.Default is false.
         /// </summary>
-        public bool DarkTheme { get; set; }
+        public bool? DarkTheme { get; set; }
 
         /// <summary>
         /// Makes the window . Default is false.
         /// </summary>
-        public bool Transparent { get; set; }
+        public bool? Transparent { get; set; }
 
         /// <summary>
         /// The type of window, default is normal window.
@@ -214,13 +214,13 @@ namespace ElectronNET.API.Entities
         /// 'default' | 'hidden' | 'hiddenInset' | 'customButtonsOnHover'
         /// </summary>
         [JsonConverter(typeof(StringEnumConverter))]
-        public TitleBarStyle TitleBarStyle { get; set; }
+        public TitleBarStyle? TitleBarStyle { get; set; }
 
         /// <summary>
         /// Shows the title in the tile bar in full screen mode on macOS for all
         /// titleBarStyle options.Default is false.
         /// </summary>
-        public bool FullscreenWindowTitle { get; set; }
+        public bool? FullscreenWindowTitle { get; set; }
 
         /// <summary>
         ///  Activate the Window Controls Overlay on Windows, when combined with <see cref="TitleBarStyle"/> = <see cref="TitleBarStyle.Hidden"/>
@@ -235,7 +235,7 @@ namespace ElectronNET.API.Entities
         /// animations. Default is true.
         /// </summary>
         [DefaultValue(true)]
-        public bool ThickFrame { get; set; } = true;
+        public bool? ThickFrame { get; set; } = true;
 
         /// <summary>
         /// Add a type of vibrancy effect to the window, only on macOS. Can be
@@ -243,7 +243,7 @@ namespace ElectronNET.API.Entities
         /// medium-light or ultra-dark.
         /// </summary>
         [JsonConverter(typeof(StringEnumConverter))]
-        public Vibrancy Vibrancy { get; set; }
+        public Vibrancy? Vibrancy { get; set; }
 
         /// <summary>
         /// Controls the behavior on macOS when option-clicking the green stoplight button
@@ -252,7 +252,7 @@ namespace ElectronNET.API.Entities
         /// it to zoom to the width of the screen.This will also affect the behavior when
         /// calling maximize() directly.Default is false.
         /// </summary>
-        public bool ZoomToPageWidth { get; set; }
+        public bool? ZoomToPageWidth { get; set; }
 
         /// <summary>
         /// Tab group name, allows opening the window as a native tab on macOS 10.12+.