diff --git a/Flow.Launcher.Plugin/Interfaces/IPublicAPI.cs b/Flow.Launcher.Plugin/Interfaces/IPublicAPI.cs
index a73ead81423..31580fbe80a 100644
--- a/Flow.Launcher.Plugin/Interfaces/IPublicAPI.cs
+++ b/Flow.Launcher.Plugin/Interfaces/IPublicAPI.cs
@@ -223,11 +223,15 @@ public interface IPublicAPI
         Task HttpDownloadAsync([NotNull] string url, [NotNull] string filePath, Action<double> reportProgress = null, CancellationToken token = default);
 
         /// <summary>
-        /// Add ActionKeyword and update action keyword metadata for specific plugin
+        /// Add ActionKeyword and update action keyword metadata for specific plugin.
         /// Before adding, please check if action keyword is already assigned by <see cref="ActionKeywordAssigned"/>
         /// </summary>
         /// <param name="pluginId">ID for plugin that needs to add action keyword</param>
         /// <param name="newActionKeyword">The actionkeyword that is supposed to be added</param>
+        /// <remarks>
+        /// If new action keyword contains any whitespace, FL will still add it but it will not work for users.
+        /// So plugin should check the whitespace before calling this function.
+        /// </remarks>
         void AddActionKeyword(string pluginId, string newActionKeyword);
 
         /// <summary>
@@ -280,9 +284,10 @@ public interface IPublicAPI
         T LoadSettingJsonStorage<T>() where T : new();
 
         /// <summary>
-        /// Save JsonStorage for current plugin's setting. This is the method used to save settings to json in Flow.Launcher
+        /// Save JsonStorage for current plugin's setting. This is the method used to save settings to json in Flow.
         /// This method will save the original instance loaded with LoadJsonStorage.
-        /// This API call is for manually Save. Flow will automatically save all setting type that has called LoadSettingJsonStorage or SaveSettingJsonStorage previously.
+        /// This API call is for manually Save.
+        /// Flow will automatically save all setting type that has called <see cref="LoadSettingJsonStorage"/> or <see cref="SaveSettingJsonStorage"/> previously.
         /// </summary>
         /// <typeparam name="T">Type for Serialization</typeparam>
         /// <returns></returns>
@@ -424,9 +429,10 @@ public interface IPublicAPI
         Task<T> LoadCacheBinaryStorageAsync<T>(string cacheName, string cacheDirectory, T defaultData) where T : new();
 
         /// <summary>
-        /// Save BinaryStorage for current plugin's cache. This is the method used to save cache to binary in Flow.Launcher
+        /// Save BinaryStorage for current plugin's cache. This is the method used to save cache to binary in Flow.
         /// This method will save the original instance loaded with LoadCacheBinaryStorageAsync.
-        /// This API call is for manually Save. Flow will automatically save all cache type that has called LoadCacheBinaryStorageAsync or SaveCacheBinaryStorageAsync previously.
+        /// This API call is for manually Save.
+        /// Flow will automatically save all cache type that has called <see cref="LoadCacheBinaryStorageAsync"/> or <see cref="SaveCacheBinaryStorageAsync"/> previously.
         /// </summary>
         /// <typeparam name="T">Type for Serialization</typeparam>
         /// <param name="cacheName">Cache file name</param>
diff --git a/Plugins/Flow.Launcher.Plugin.Explorer/Views/ActionKeywordSetting.xaml b/Plugins/Flow.Launcher.Plugin.Explorer/Views/ActionKeywordSetting.xaml
index d4250534860..37a7ccb8d5b 100644
--- a/Plugins/Flow.Launcher.Plugin.Explorer/Views/ActionKeywordSetting.xaml
+++ b/Plugins/Flow.Launcher.Plugin.Explorer/Views/ActionKeywordSetting.xaml
@@ -80,6 +80,7 @@
                         Width="135"
                         HorizontalAlignment="Left"
                         VerticalAlignment="Center"
+                        DataObject.Pasting="TextBox_Pasting"
                         PreviewKeyDown="TxtCurrentActionKeyword_OnKeyDown"
                         Text="{Binding ActionKeyword}" />
                 </StackPanel>
diff --git a/Plugins/Flow.Launcher.Plugin.Explorer/Views/ActionKeywordSetting.xaml.cs b/Plugins/Flow.Launcher.Plugin.Explorer/Views/ActionKeywordSetting.xaml.cs
index 000b2558d14..10ce28fe4ed 100644
--- a/Plugins/Flow.Launcher.Plugin.Explorer/Views/ActionKeywordSetting.xaml.cs
+++ b/Plugins/Flow.Launcher.Plugin.Explorer/Views/ActionKeywordSetting.xaml.cs
@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Linq;
 using System.Runtime.CompilerServices;
 using System.Windows;
 using System.Windows.Input;
@@ -85,7 +86,7 @@ private void BtnCancel_OnClick(object sender, RoutedEventArgs e)
             DialogResult = false;
             Close();
         }
-
+        
         private void TxtCurrentActionKeyword_OnKeyDown(object sender, KeyEventArgs e)
         {
             if (e.Key == Key.Enter)
@@ -94,14 +95,34 @@ private void TxtCurrentActionKeyword_OnKeyDown(object sender, KeyEventArgs e)
                 OnDoneButtonClick(sender, e);
                 e.Handled = true;
             }
+            if (e.Key == Key.Space)
+            {
+                e.Handled = true;
+            }
         }
-
+        
+        private void TextBox_Pasting(object sender, DataObjectPastingEventArgs e)
+        {
+            if (e.DataObject.GetDataPresent(DataFormats.Text))
+            {
+                string text = e.DataObject.GetData(DataFormats.Text) as string;
+                if (!string.IsNullOrEmpty(text) && text.Any(char.IsWhiteSpace))
+                {
+                    e.CancelCommand();
+                }
+            }
+            else
+            {
+                e.CancelCommand();
+            }
+        }
+        
         public event PropertyChangedEventHandler PropertyChanged;
         protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
         {
             PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
         }
-
+        
         private bool SetField<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
         {
             if (EqualityComparer<T>.Default.Equals(field, value))
diff --git a/Plugins/Flow.Launcher.Plugin.WebSearch/SearchSourceSetting.xaml b/Plugins/Flow.Launcher.Plugin.WebSearch/SearchSourceSetting.xaml
index 3df50b3edc8..746c9cf848f 100644
--- a/Plugins/Flow.Launcher.Plugin.WebSearch/SearchSourceSetting.xaml
+++ b/Plugins/Flow.Launcher.Plugin.WebSearch/SearchSourceSetting.xaml
@@ -56,13 +56,13 @@
                     </Button>
                 </Grid>
             </StackPanel>
-            <StackPanel Margin="26,12,26,0">
+            <StackPanel Margin="26 12 26 0">
                 <Grid>
                     <StackPanel>
-                        <StackPanel Grid.Row="0" Margin="0,0,0,12">
+                        <StackPanel Grid.Row="0" Margin="0 0 0 12">
                             <TextBlock
                                 Grid.Column="0"
-                                Margin="0,0,0,0"
+                                Margin="0 0 0 0"
                                 FontSize="20"
                                 FontWeight="SemiBold"
                                 Text="{DynamicResource flowlauncher_plugin_websearch_window_title}"
@@ -75,7 +75,7 @@
                                 TextAlignment="Left"
                                 TextWrapping="WrapWithOverflow" />
                             <TextBox
-                                Margin="0,12,0,12"
+                                Margin="0 12 0 12"
                                 FontSize="14"
                                 FontWeight="SemiBold"
                                 IsReadOnly="True"
@@ -83,7 +83,7 @@
                                 TextAlignment="Center"
                                 TextWrapping="WrapWithOverflow" />
                             <TextBlock
-                                Margin="0,0,0,14"
+                                Margin="0 0 0 14"
                                 FontSize="14"
                                 Text="{DynamicResource flowlauncher_plugin_websearch_guide_3}"
                                 TextAlignment="Left"
@@ -105,7 +105,7 @@
                                 <TextBlock
                                     Grid.Row="0"
                                     Grid.Column="0"
-                                    Margin="10,10,15,10"
+                                    Margin="10 10 15 10"
                                     HorizontalAlignment="Stretch"
                                     VerticalAlignment="Center"
                                     FontSize="14"
@@ -120,7 +120,7 @@
                                 <TextBlock
                                     Grid.Row="1"
                                     Grid.Column="0"
-                                    Margin="10,10,15,10"
+                                    Margin="10 10 15 10"
                                     HorizontalAlignment="Left"
                                     VerticalAlignment="Center"
                                     FontSize="14"
@@ -131,7 +131,7 @@
                                     Orientation="Horizontal">
                                     <Button
                                         Height="35"
-                                        Margin="10,0,0,0"
+                                        Margin="10 0 0 0"
                                         VerticalAlignment="Center"
                                         Click="OnSelectIconClick"
                                         Content="{DynamicResource flowlauncher_plugin_websearch_select_icon}" />
@@ -139,13 +139,13 @@
                                         Name="imgPreviewIcon"
                                         Width="24"
                                         Height="24"
-                                        Margin="14,0,0,0"
+                                        Margin="14 0 0 0"
                                         VerticalAlignment="Center" />
                                 </StackPanel>
                                 <TextBlock
                                     Grid.Row="2"
                                     Grid.Column="0"
-                                    Margin="10,10,15,10"
+                                    Margin="10 10 15 10"
                                     HorizontalAlignment="Left"
                                     VerticalAlignment="Center"
                                     FontSize="14"
@@ -160,7 +160,7 @@
                                 <TextBlock
                                     Grid.Row="3"
                                     Grid.Column="0"
-                                    Margin="10,10,15,10"
+                                    Margin="10 10 15 10"
                                     HorizontalAlignment="Left"
                                     VerticalAlignment="Center"
                                     FontSize="14"
@@ -168,14 +168,16 @@
                                 <TextBox
                                     Grid.Row="3"
                                     Grid.Column="1"
-                                    Margin="10,0,10,0"
+                                    Margin="10 0 10 0"
                                     HorizontalAlignment="Stretch"
                                     VerticalAlignment="Center"
+                                    DataObject.Pasting="TextBox_Pasting"
+                                    PreviewKeyDown="TextBox_PreviewKeyDown"
                                     Text="{Binding SearchSource.ActionKeyword}" />
                                 <TextBlock
                                     Grid.Row="4"
                                     Grid.Column="0"
-                                    Margin="10,10,15,15"
+                                    Margin="10 10 15 15"
                                     HorizontalAlignment="Left"
                                     VerticalAlignment="Center"
                                     FontSize="14"
@@ -183,7 +185,7 @@
                                 <CheckBox
                                     Grid.Row="4"
                                     Grid.Column="1"
-                                    Margin="10,10,10,15"
+                                    Margin="10 10 10 15"
                                     VerticalAlignment="Center"
                                     IsChecked="{Binding SearchSource.Enabled}" />
                             </Grid>
@@ -196,16 +198,16 @@
             Grid.Row="1"
             Background="{DynamicResource PopupButtonAreaBGColor}"
             BorderBrush="{DynamicResource PopupButtonAreaBorderColor}"
-            BorderThickness="0,1,0,0">
+            BorderThickness="0 1 0 0">
             <StackPanel HorizontalAlignment="Center" Orientation="Horizontal">
                 <Button
                     MinWidth="140"
-                    Margin="10,0,5,0"
+                    Margin="10 0 5 0"
                     Click="OnCancelButtonClick"
                     Content="{DynamicResource flowlauncher_plugin_websearch_cancel}" />
                 <Button
                     MinWidth="140"
-                    Margin="5,0,10,0"
+                    Margin="5 0 10 0"
                     Click="OnConfirmButtonClick"
                     Content="{DynamicResource flowlauncher_plugin_websearch_confirm}"
                     Style="{DynamicResource AccentButtonStyle}" />
diff --git a/Plugins/Flow.Launcher.Plugin.WebSearch/SearchSourceSetting.xaml.cs b/Plugins/Flow.Launcher.Plugin.WebSearch/SearchSourceSetting.xaml.cs
index b44f130e47b..acc2c1e5c2c 100644
--- a/Plugins/Flow.Launcher.Plugin.WebSearch/SearchSourceSetting.xaml.cs
+++ b/Plugins/Flow.Launcher.Plugin.WebSearch/SearchSourceSetting.xaml.cs
@@ -1,5 +1,7 @@
 using System.Collections.Generic;
+using System.Linq;
 using System.Windows;
+using System.Windows.Input;
 using Microsoft.Win32;
 
 namespace Flow.Launcher.Plugin.WebSearch
@@ -145,6 +147,30 @@ private async void OnSelectIconClick(object sender, RoutedEventArgs e)
                 }
             }
         }
+
+        //Block Space Input
+        private void TextBox_PreviewKeyDown(object sender, KeyEventArgs e)
+        {
+            if (e.Key == Key.Space)
+            {
+                e.Handled = true;
+            }
+        }
+        private void TextBox_Pasting(object sender, DataObjectPastingEventArgs e)
+        {
+            if (e.DataObject.GetDataPresent(DataFormats.Text))
+            {
+                string text = e.DataObject.GetData(DataFormats.Text) as string;
+                if (!string.IsNullOrEmpty(text) && text.Any(char.IsWhiteSpace))
+                {
+                    e.CancelCommand();
+                }
+            }
+            else
+            {
+                e.CancelCommand();
+            }
+        }
     }
 
     public enum Action