diff --git a/Flow.Launcher.Core/Resource/Theme.cs b/Flow.Launcher.Core/Resource/Theme.cs
index fe64e0c3e17..e70de673e4c 100644
--- a/Flow.Launcher.Core/Resource/Theme.cs
+++ b/Flow.Launcher.Core/Resource/Theme.cs
@@ -28,6 +28,10 @@ public class Theme
         private string DirectoryPath => Path.Combine(Constant.ProgramDirectory, Folder);
         private string UserDirectoryPath => Path.Combine(DataLocation.DataDirectory(), Folder);
 
+        public bool BlurEnabled { get; set; }
+
+        private double mainWindowWidth;
+
         public Theme()
         {
             _themeDirectories.Add(DirectoryPath);
@@ -88,8 +92,12 @@ public bool ChangeTheme(string theme)
                     _oldTheme = Path.GetFileNameWithoutExtension(_oldResource.Source.AbsolutePath);
                 }
 
-                if (Settings.UseDropShadowEffect)
+                BlurEnabled = IsBlurTheme();
+
+                if (Settings.UseDropShadowEffect && !BlurEnabled)
                     AddDropShadowEffectToCurrentTheme();
+
+                SetBlurForWindow();
             }
             catch (DirectoryNotFoundException e)
             {
@@ -181,6 +189,21 @@ public ResourceDictionary GetResourceDictionary()
                 Array.ForEach(new[] { resultItemStyle, resultSubItemStyle, resultItemSelectedStyle, resultSubItemSelectedStyle }, o => Array.ForEach(setters, p => o.Setters.Add(p)));
             }
 
+            var windowStyle = dict["WindowStyle"] as Style;
+
+            var width = windowStyle?.Setters.OfType<Setter>().Where(x => x.Property.Name == "Width")
+                .Select(x => x.Value).FirstOrDefault();
+
+            if (width == null)
+            {
+                windowStyle = dict["BaseWindowStyle"] as Style;
+
+                width = windowStyle?.Setters.OfType<Setter>().Where(x => x.Property.Name == "Width")
+                .Select(x => x.Value).FirstOrDefault();
+            }
+
+            mainWindowWidth = (double)width;
+
             return dict;
         }
 
@@ -252,7 +275,7 @@ public void AddDropShadowEffectToCurrentTheme()
             UpdateResourceDictionary(dict);
         }
 
-        public void RemoveDropShadowEffectToCurrentTheme()
+        public void RemoveDropShadowEffectFromCurrentTheme()
         {
             var dict = CurrentThemeResourceDictionary();
             var windowBorderStyle = dict["WindowBorderStyle"] as Style;
@@ -320,35 +343,39 @@ private enum WindowCompositionAttribute
         /// </summary>
         public void SetBlurForWindow()
         {
+            if (BlurEnabled)
+            {
+                SetWindowAccent(Application.Current.MainWindow, AccentState.ACCENT_ENABLE_BLURBEHIND);
+            }
+            else
+            {
+                SetWindowAccent(Application.Current.MainWindow, AccentState.ACCENT_DISABLED);
+            }
+        }
 
-            // Exception of FindResource can't be cathed if global exception handle is set
+        private bool IsBlurTheme()
+        {
             if (Environment.OSVersion.Version >= new Version(6, 2))
             {
                 var resource = Application.Current.TryFindResource("ThemeBlurEnabled");
-                bool blur;
+
                 if (resource is bool)
-                {
-                    blur = (bool)resource;
-                }
-                else
-                {
-                    blur = false;
-                }
+                    return (bool)resource;
 
-                if (blur)
-                {
-                    SetWindowAccent(Application.Current.MainWindow, AccentState.ACCENT_ENABLE_BLURBEHIND);
-                }
-                else
-                {
-                    SetWindowAccent(Application.Current.MainWindow, AccentState.ACCENT_DISABLED);
-                }
+                return false;
             }
+
+            return false;
         }
 
         private void SetWindowAccent(Window w, AccentState state)
         {
             var windowHelper = new WindowInteropHelper(w);
+            
+            // this determines the width of the main query window
+            w.Width = mainWindowWidth;
+            windowHelper.EnsureHandle();
+            
             var accent = new AccentPolicy { AccentState = state };
             var accentStructSize = Marshal.SizeOf(accent);
 
diff --git a/Flow.Launcher/Languages/en.xaml b/Flow.Launcher/Languages/en.xaml
index 573403823ca..efb82b47813 100644
--- a/Flow.Launcher/Languages/en.xaml
+++ b/Flow.Launcher/Languages/en.xaml
@@ -39,6 +39,7 @@
     <system:String x:Key="querySearchPrecision">Query Search Precision</system:String>
     <system:String x:Key="ShouldUsePinyin">Should Use Pinyin</system:String>
     <system:String x:Key="ShouldUsePinyinToolTip">Allows using Pinyin to search. Pinyin is the standard system of romanized spelling for transliterating Chinese</system:String>
+    <system:String x:Key="shadowEffectNotAllowed">Shadow effect is not allowed while current theme has blur effect enabled</system:String>
 
     <!--Setting Plugin-->
     <system:String x:Key="plugin">Plugin</system:String>
diff --git a/Flow.Launcher/MainWindow.xaml b/Flow.Launcher/MainWindow.xaml
index aa0240dd428..7d0632d7039 100644
--- a/Flow.Launcher/MainWindow.xaml
+++ b/Flow.Launcher/MainWindow.xaml
@@ -60,7 +60,7 @@
         <KeyBinding Key="D8" Modifiers="{Binding OpenResultCommandModifiers}" Command="{Binding OpenResultCommand}" CommandParameter="7"></KeyBinding>
         <KeyBinding Key="D9" Modifiers="{Binding OpenResultCommandModifiers}" Command="{Binding OpenResultCommand}" CommandParameter="8"></KeyBinding>
     </Window.InputBindings>
-    <Grid Width="750">
+    <Grid>
         <Border Style="{DynamicResource WindowBorderStyle}" MouseDown="OnMouseDown" CornerRadius="5" >
             <StackPanel Orientation="Vertical">
                 <Grid>
diff --git a/Flow.Launcher/MainWindow.xaml.cs b/Flow.Launcher/MainWindow.xaml.cs
index 4355cda154b..735103938f0 100644
--- a/Flow.Launcher/MainWindow.xaml.cs
+++ b/Flow.Launcher/MainWindow.xaml.cs
@@ -61,8 +61,6 @@ private void OnLoaded(object sender, RoutedEventArgs _)
             // show notify icon when flowlauncher is hidden
             InitializeNotifyIcon();
 
-            // todo is there a way to set blur only once?
-            ThemeManager.Instance.SetBlurForWindow();
             WindowsInteropHelper.DisableControlBox(this);
             InitProgressbarAnimation();
             InitializePosition();
diff --git a/Flow.Launcher/SettingWindow.xaml b/Flow.Launcher/SettingWindow.xaml
index 0d966f1d652..1a8a12100df 100644
--- a/Flow.Launcher/SettingWindow.xaml
+++ b/Flow.Launcher/SettingWindow.xaml
@@ -242,7 +242,7 @@
                                 <RowDefinition Height="30"/>
                             </Grid.RowDefinitions>
                             <TextBlock Grid.Row="0" Text="{DynamicResource queryWindowShadowEffect}" Margin="0 30 0 0" FontSize="14" />
-                            <ui:ToggleSwitch Grid.Row="0" IsOn="{Binding DropShadowEffect}" Margin="210 23 0 0" Width="80"/>
+                            <ui:ToggleSwitch Grid.Row="0" IsOn="{Binding DropShadowEffect, Mode=TwoWay}" Margin="210 23 0 0" Width="80"/>
                             <TextBlock  Grid.Row="1" Text="{DynamicResource shadowEffectCPUUsage}"
                                         Width="280"
                                         FontSize="10" HorizontalAlignment="Left"/>
diff --git a/Flow.Launcher/Themes/Base.xaml b/Flow.Launcher/Themes/Base.xaml
index eb2af490a30..df0304bc210 100644
--- a/Flow.Launcher/Themes/Base.xaml
+++ b/Flow.Launcher/Themes/Base.xaml
@@ -46,6 +46,8 @@
         <Setter Property="Padding" Value="8 10 8 8" />
     </Style>
     <Style x:Key="BaseWindowStyle" TargetType="{x:Type Window}">
+        <Setter Property="Width" Value="750" />
+        <Setter Property="RenderOptions.ClearTypeHint" Value="Enabled"/>
     </Style>
 
     <Style x:Key="BasePendingLineStyle" TargetType="{x:Type Line}">
diff --git a/Flow.Launcher/Themes/BlurBlack Darker.xaml b/Flow.Launcher/Themes/BlurBlack Darker.xaml
index 5c615d50095..2fb3f1faa92 100644
--- a/Flow.Launcher/Themes/BlurBlack Darker.xaml	
+++ b/Flow.Launcher/Themes/BlurBlack Darker.xaml	
@@ -25,7 +25,6 @@
     </Style>
 
     <Style x:Key="WindowStyle" BasedOn="{StaticResource BaseWindowStyle}" TargetType="{x:Type Window}">
-        <Setter Property="Width" Value="750" /> <!-- This is used to set the blur width only -->
         <Setter Property="Background">
             <Setter.Value>
                 <SolidColorBrush Color="Black" Opacity="0.6"/>
diff --git a/Flow.Launcher/Themes/BlurBlack.xaml b/Flow.Launcher/Themes/BlurBlack.xaml
index dc80c144b9a..c03285af0ee 100644
--- a/Flow.Launcher/Themes/BlurBlack.xaml
+++ b/Flow.Launcher/Themes/BlurBlack.xaml
@@ -25,7 +25,6 @@
     </Style>
 
     <Style x:Key="WindowStyle" BasedOn="{StaticResource BaseWindowStyle}" TargetType="{x:Type Window}">
-        <Setter Property="Width" Value="750" /> <!-- This is used to set the blur width only -->
         <Setter Property="Background">
             <Setter.Value>
                 <SolidColorBrush Color="Black" Opacity="0.3"/>
diff --git a/Flow.Launcher/Themes/BlurWhite.xaml b/Flow.Launcher/Themes/BlurWhite.xaml
index 6a130bb39ec..d88c033c977 100644
--- a/Flow.Launcher/Themes/BlurWhite.xaml
+++ b/Flow.Launcher/Themes/BlurWhite.xaml
@@ -23,7 +23,6 @@
     </Style>
 
     <Style x:Key="WindowStyle" BasedOn="{StaticResource BaseWindowStyle}" TargetType="{x:Type Window}">
-        <Setter Property="Width" Value="750" /> <!-- This is used to set the blur width only -->
         <Setter Property="Background">
             <Setter.Value>
                 <SolidColorBrush Color="White" Opacity="0.5"/>
diff --git a/Flow.Launcher/ViewModel/SettingWindowViewModel.cs b/Flow.Launcher/ViewModel/SettingWindowViewModel.cs
index b974efd0337..53789d2d90d 100644
--- a/Flow.Launcher/ViewModel/SettingWindowViewModel.cs
+++ b/Flow.Launcher/ViewModel/SettingWindowViewModel.cs
@@ -271,6 +271,9 @@ public string SelectedTheme
             {
                 Settings.Theme = value;
                 ThemeManager.Instance.ChangeTheme(value);
+                
+                if (ThemeManager.Instance.BlurEnabled && Settings.UseDropShadowEffect)
+                    DropShadowEffect = false;
             }
         }
 
@@ -282,13 +285,19 @@ public bool DropShadowEffect
             get { return Settings.UseDropShadowEffect; }
             set
             {
+                if (ThemeManager.Instance.BlurEnabled && value)
+                {
+                    MessageBox.Show(InternationalizationManager.Instance.GetTranslation("shadowEffectNotAllowed"));
+                    return;
+                }
+
                 if (value)
                 {
                     ThemeManager.Instance.AddDropShadowEffectToCurrentTheme();
                 }
                 else
                 {
-                    ThemeManager.Instance.RemoveDropShadowEffectToCurrentTheme();
+                    ThemeManager.Instance.RemoveDropShadowEffectFromCurrentTheme();
                 }
 
                 Settings.UseDropShadowEffect = value;