diff --git a/COFTester/MainWindow.xaml b/COFTester/MainWindow.xaml
index cf3421e..bdecdb1 100644
--- a/COFTester/MainWindow.xaml
+++ b/COFTester/MainWindow.xaml
@@ -346,17 +346,21 @@
                         <Border Style="{StaticResource PanelBorderStyle}"
                                 Background="{StaticResource SurfaceRaisedBrush}"
                                 Margin="0,0,0,14">
-                            <DockPanel LastChildFill="False">
-                                <StackPanel DockPanel.Dock="Left">
+                            <Grid>
+                                <Grid.ColumnDefinitions>
+                                    <ColumnDefinition Width="*" />
+                                    <ColumnDefinition Width="Auto" />
+                                </Grid.ColumnDefinitions>
+                                <StackPanel Grid.Column="0" Margin="0,0,12,0">
                                     <TextBlock Style="{StaticResource SectionTitleStyle}" Text="试验参数" />
                                     <TextBlock Style="{StaticResource SectionHintStyle}" Text="参数编辑保留在侧栏，主界面聚焦控制、曲线和结果。" />
                                 </StackPanel>
-                                <Button DockPanel.Dock="Right"
+                                <Button Grid.Column="1"
                                         Width="88"
                                         Style="{StaticResource GhostButtonStyle}"
                                         Click="ToggleSidebar_Click"
                                         Content="收起" />
-                            </DockPanel>
+                            </Grid>
                         </Border>
 
                         <Border Style="{StaticResource PanelBorderStyle}"