diff --git a/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainBody.xaml b/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainBody.xaml
index 458ff99..53c2379 100644
--- a/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainBody.xaml
+++ b/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainBody.xaml
@@ -63,7 +63,10 @@
                 IsEnabled="{x:Bind ViewModel.IsGenerating, Mode=OneWay, Converter={StaticResource ObjectToBoolReverseConverter}}"
                 Visibility="{x:Bind ViewModel.IsVariableEmpty, Mode=OneWay, Converter={StaticResource BoolToVisibilityReverseConverter}}">
                 <Button.Flyout>
-                    <Flyout Placement="Top" ShouldConstrainToRootBounds="False">
+                    <Flyout
+                        Opened="OnVariableFlyoutOpened"
+                        Placement="Top"
+                        ShouldConstrainToRootBounds="False">
                         <Grid Width="380">
                             <ItemsRepeater ItemsSource="{x:Bind ViewModel.Variables}">
                                 <ItemsRepeater.ItemTemplate>
@@ -88,7 +91,9 @@
                                                 HorizontalAlignment="Stretch"
                                                 x:Load="{x:Bind Values, Mode=OneWay, Converter={StaticResource ObjectToBoolReverseConverter}}"
                                                 AcceptsReturn="True"
+                                                AllowFocusOnInteraction="True"
                                                 Header="{x:Bind Name}"
+                                                IsEnabled="{x:Bind IsEnabled, Mode=OneWay}"
                                                 PlaceholderText="{x:Bind Name}"
                                                 Text="{x:Bind Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                                                 TextWrapping="Wrap"
diff --git a/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainBody.xaml.cs b/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainBody.xaml.cs
index 99fdb41..0be2637 100644
--- a/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainBody.xaml.cs
+++ b/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainBody.xaml.cs
@@ -13,7 +13,8 @@ public sealed partial class PromptTestMainBody : PromptTestPageControlBase
     public PromptTestMainBody() => InitializeComponent();
 
     private void OnTextBoxLostFocus(object sender, RoutedEventArgs e)
-    {
-        ViewModel?.UpdatePromptVariablesCommand.Execute(default);
-    }
+        => ViewModel?.UpdatePromptVariablesCommand.Execute(default);
+
+    private void OnVariableFlyoutOpened(object sender, object e)
+        => ViewModel?.CheckDefaultInputVariableCommand.Execute(default);
 }
diff --git a/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainHeader.xaml b/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainHeader.xaml
index b64887c..f32fcd2 100644
--- a/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainHeader.xaml
+++ b/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainHeader.xaml
@@ -27,21 +27,38 @@
             Grid.Column="1"
             HorizontalAlignment="Center"
             SelectionChanged="OnPromptSelectionChanged" />
-        <Button
+        <StackPanel
             Grid.Column="2"
             VerticalAlignment="Center"
-            Command="{x:Bind ViewModel.SaveHistoryJsonCommand}"
-            IsEnabled="{x:Bind ViewModel.IsGenerating, Mode=OneWay, Converter={StaticResource ObjectToBoolReverseConverter}}"
-            Style="{StaticResource IconButtonStyle}"
-            ToolTipService.ToolTip="{ext:Locale Name=SaveAs}"
-            Visibility="{x:Bind ViewModel.CurrentSystemPrompt, Mode=OneWay, Converter={StaticResource ObjectToVisibilityConverter}}">
-            <ic:SymbolIcon FontSize="14" Symbol="Save" />
-            <Button.KeyboardAccelerators>
-                <KeyboardAccelerator
-                    Key="S"
-                    IsEnabled="True"
-                    Modifiers="Control" />
-            </Button.KeyboardAccelerators>
-        </Button>
+            Orientation="Horizontal">
+            <Button
+                Command="{x:Bind ViewModel.ReloadMessagesCommand}"
+                IsEnabled="{x:Bind ViewModel.IsGenerating, Mode=OneWay, Converter={StaticResource ObjectToBoolReverseConverter}}"
+                Style="{StaticResource IconButtonStyle}"
+                ToolTipService.ToolTip="{ext:Locale Name=Reload}"
+                Visibility="{x:Bind ViewModel.CurrentSystemPrompt, Mode=OneWay, Converter={StaticResource ObjectToVisibilityConverter}}">
+                <ic:SymbolIcon FontSize="14" Symbol="ArrowClockwise" />
+                <Button.KeyboardAccelerators>
+                    <KeyboardAccelerator
+                        Key="R"
+                        IsEnabled="True"
+                        Modifiers="Control" />
+                </Button.KeyboardAccelerators>
+            </Button>
+            <Button
+                Command="{x:Bind ViewModel.SaveHistoryJsonCommand}"
+                IsEnabled="{x:Bind ViewModel.IsGenerating, Mode=OneWay, Converter={StaticResource ObjectToBoolReverseConverter}}"
+                Style="{StaticResource IconButtonStyle}"
+                ToolTipService.ToolTip="{ext:Locale Name=SaveAs}"
+                Visibility="{x:Bind ViewModel.CurrentSystemPrompt, Mode=OneWay, Converter={StaticResource ObjectToVisibilityConverter}}">
+                <ic:SymbolIcon FontSize="14" Symbol="Save" />
+                <Button.KeyboardAccelerators>
+                    <KeyboardAccelerator
+                        Key="S"
+                        IsEnabled="True"
+                        Modifiers="Control" />
+                </Button.KeyboardAccelerators>
+            </Button>
+        </StackPanel>
     </Grid>
 </local:PromptTestPageControlBase>
diff --git a/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainHeader.xaml.cs b/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainHeader.xaml.cs
index 1a1b608..b7c87ef 100644
--- a/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainHeader.xaml.cs
+++ b/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestMainHeader.xaml.cs
@@ -30,6 +30,11 @@ private void OnSystemPromptInitialized(object? sender, EventArgs e)
 
     private void OnPromptSelectionChanged(SelectorBar sender, SelectorBarSelectionChangedEventArgs args)
     {
+        if (sender.SelectedItem is null)
+        {
+            return;
+        }
+
         var item = sender.SelectedItem.Tag as PromptTestSystemPromptItemViewModel;
         if (ViewModel.CurrentSystemPrompt == item)
         {
diff --git a/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestSideBody.xaml b/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestSideBody.xaml
index b71ba64..3c6d8e6 100644
--- a/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestSideBody.xaml
+++ b/src/Desktop/RodelAgent.UI/Controls/Internal/PromptTestSideBody.xaml
@@ -74,6 +74,7 @@
                             <Grid.ColumnDefinitions>
                                 <ColumnDefinition />
                                 <ColumnDefinition Width="Auto" />
+                                <ColumnDefinition Width="Auto" />
                             </Grid.ColumnDefinitions>
                             <TextBlock
                                 HorizontalAlignment="Left"
@@ -87,9 +88,22 @@
                                 VerticalAlignment="Center"
                                 Command="{x:Bind ViewModel.OpenInputFileCommand}"
                                 Style="{StaticResource SmallIconButtonStyle}"
-                                ToolTipService.ToolTip="{ext:Locale Name=OpenFile}">
+                                ToolTipService.ToolTip="{ext:Locale Name=OpenFile}"
+                                Visibility="{x:Bind ViewModel.InputFilePath, Mode=OneWay, Converter={StaticResource ObjectToVisibilityConverter}}">
                                 <ic:SymbolIcon FontSize="14" Symbol="Open" />
                             </Button>
+                            <Button
+                                Grid.Column="2"
+                                VerticalAlignment="Center"
+                                Command="{x:Bind ViewModel.RemoveInputCommand}"
+                                Style="{StaticResource SmallIconButtonStyle}"
+                                ToolTipService.ToolTip="{ext:Locale Name=Delete}"
+                                Visibility="{x:Bind ViewModel.InputFilePath, Mode=OneWay, Converter={StaticResource ObjectToVisibilityConverter}}">
+                                <ic:SymbolIcon
+                                    FontSize="14"
+                                    Foreground="{ThemeResource SystemFillColorCriticalBrush}"
+                                    Symbol="Delete" />
+                            </Button>
                         </Grid>
                     </base:SettingsExpander.ItemsFooter>
                 </base:SettingsExpander>
@@ -124,7 +138,8 @@
                                 VerticalAlignment="Center"
                                 Command="{x:Bind ViewModel.OpenHistoryFileCommand}"
                                 Style="{StaticResource SmallIconButtonStyle}"
-                                ToolTipService.ToolTip="{ext:Locale Name=OpenFile}">
+                                ToolTipService.ToolTip="{ext:Locale Name=OpenFile}"
+                                Visibility="{x:Bind ViewModel.MessageJsonFilePath, Mode=OneWay, Converter={StaticResource ObjectToVisibilityConverter}}">
                                 <ic:SymbolIcon FontSize="14" Symbol="Open" />
                             </Button>
                         </Grid>
@@ -161,7 +176,8 @@
                                 VerticalAlignment="Center"
                                 Command="{x:Bind ViewModel.OpenVariablesFileCommand}"
                                 Style="{StaticResource SmallIconButtonStyle}"
-                                ToolTipService.ToolTip="{ext:Locale Name=OpenFile}">
+                                ToolTipService.ToolTip="{ext:Locale Name=OpenFile}"
+                                Visibility="{x:Bind ViewModel.PresetVariablesFilePath, Mode=OneWay, Converter={StaticResource ObjectToVisibilityConverter}}">
                                 <ic:SymbolIcon FontSize="14" Symbol="Open" />
                             </Button>
                         </Grid>
diff --git a/src/Desktop/RodelAgent.UI/Resources/zh-Hans-CN/Resources.resw b/src/Desktop/RodelAgent.UI/Resources/zh-Hans-CN/Resources.resw
index e2ceffd..b19724e 100644
--- a/src/Desktop/RodelAgent.UI/Resources/zh-Hans-CN/Resources.resw
+++ b/src/Desktop/RodelAgent.UI/Resources/zh-Hans-CN/Resources.resw
@@ -1259,4 +1259,7 @@
   <data name="HideWhenCloseDescription" xml:space="preserve">
     <value>关闭窗口时隐藏应用而非退出</value>
   </data>
+  <data name="Reload" xml:space="preserve">
+    <value>重新载入</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/Desktop/RodelAgent.UI/ViewModels/Items/VariableItemViewModel.cs b/src/Desktop/RodelAgent.UI/ViewModels/Items/VariableItemViewModel.cs
index d54249e..9b139c9 100644
--- a/src/Desktop/RodelAgent.UI/ViewModels/Items/VariableItemViewModel.cs
+++ b/src/Desktop/RodelAgent.UI/ViewModels/Items/VariableItemViewModel.cs
@@ -16,6 +16,9 @@ public sealed partial class VariableItemViewModel : ViewModelBase
     [ObservableProperty]
     private List<string>? _values;
 
+    [ObservableProperty]
+    private bool _isEnabled;
+
     /// <summary>
     /// Initializes a new instance of the <see cref="VariableItemViewModel"/> class.
     /// </summary>
@@ -27,6 +30,7 @@ public VariableItemViewModel(
         Name = name;
         Values = selectValues;
         Value = defaultValue ?? Values?.FirstOrDefault() ?? string.Empty;
+        IsEnabled = true;
     }
 
     /// <inheritdoc/>
diff --git a/src/Desktop/RodelAgent.UI/ViewModels/Pages/PromptTestPageViewModel/PromptTestPageViewModel.Config.cs b/src/Desktop/RodelAgent.UI/ViewModels/Pages/PromptTestPageViewModel/PromptTestPageViewModel.Config.cs
index 60d4917..4ef3192 100644
--- a/src/Desktop/RodelAgent.UI/ViewModels/Pages/PromptTestPageViewModel/PromptTestPageViewModel.Config.cs
+++ b/src/Desktop/RodelAgent.UI/ViewModels/Pages/PromptTestPageViewModel/PromptTestPageViewModel.Config.cs
@@ -59,7 +59,7 @@ private async Task ImportVariablesAsync()
             PresetVariablesFilePath = file.Path;
             SettingsToolkit.WriteLocalSetting(SettingNames.PromptTestPresetVariablesFilePath, PresetVariablesFilePath);
             Variables.Clear();
-            _variables.Clear();
+            _variables?.Clear();
             await ParsePresetVariablesAsync(PresetVariablesFilePath);
         }
     }
@@ -201,6 +201,35 @@ private async Task OpenVariablesFileAsync()
     private async Task OpenHistoryFileAsync()
         => await Launcher.LaunchFileAsync(await StorageFile.GetFileFromPathAsync(MessageJsonFilePath));
 
+    [RelayCommand]
+    private void RemoveInput()
+    {
+        InputFilePath = string.Empty;
+        SettingsToolkit.WriteLocalSetting(SettingNames.PromptTestInputFilePath, InputFilePath);
+        _inputs.Clear();
+        InputsCount = 0;
+    }
+
+    [RelayCommand]
+    private void CheckDefaultInputVariable()
+    {
+        if (string.IsNullOrEmpty(_defaultInputVariable))
+        {
+            return;
+        }
+
+        var shouldDisableDefaultInputVariable = _inputs?.Count > 0;
+        var defaultInputVariable = Variables.FirstOrDefault(p => p.Name == _defaultInputVariable);
+        if (defaultInputVariable is not null)
+        {
+            defaultInputVariable.IsEnabled = !shouldDisableDefaultInputVariable;
+        }
+    }
+
+    [RelayCommand]
+    private Task ReloadMessagesAsync()
+        => ParseHistoryAsync(MessageJsonFilePath, true);
+
     private async Task ParseInputAsync(string filePath, bool showTip = true)
     {
         try
diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index b661856..c4933d7 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -7,7 +7,7 @@
     <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
     <CodeAnalysisRuleSet>$(MSBuildThisFileDirectory)App.ruleset</CodeAnalysisRuleSet>
-    <NoWarn>$(NoWarn);NU1701;CS9057;MSB3277;NETSDK1206;NU1507;NU1008;CA2007;CS8622;SKEXP0010;SKEXP0001;CS1570</NoWarn>
+    <NoWarn>$(NoWarn);NU1701;CS9057;MSB3277;NETSDK1206;NU1507;NU1008;CA2007;CS8622;SKEXP0010;SKEXP0001;CS1570;NU1900</NoWarn>
     <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <RunAnalyzersDuringBuild>true</RunAnalyzersDuringBuild>