diff --git a/MainWindow.axaml b/MainWindow.axaml
index 2f76936..bd7b3b9 100644
--- a/MainWindow.axaml
+++ b/MainWindow.axaml
@@ -344,7 +344,7 @@
                     </TabItem.Header>
                     <Grid ColumnDefinitions="300,*">
                         <Border Grid.Column="0" Background="#FFF" BorderBrush="#DDD" BorderThickness="0,0,1,0">
-                            <StackPanel>
+                            <Grid RowDefinitions="Auto,*">
                                 <StackPanel Spacing="10" Orientation="Horizontal" Margin="10">
                                     <Button x:Name="BtnWikiAddFile"
                                             Click="BtnWikiAddFile_OnClick">
@@ -364,10 +364,11 @@
                                         <LucideIcon Kind="RefreshCcw" Width="24" Height="24" />
                                     </Button>
                                 </StackPanel>
-                                <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
-                                    <TreeView Name="NavTree" Margin="10" />
-                                </ScrollViewer>
-                            </StackPanel>
+                                <TreeView Grid.Row="1" Name="NavTree"
+                                          Margin="10"
+                                          HorizontalAlignment="Stretch"
+                                          VerticalAlignment="Stretch" />
+                            </Grid>
                         </Border>
 
                         <Grid Grid.Column="1">