diff --git a/src/Ursa.Themes.Semi/Controls/NavMenu.axaml b/src/Ursa.Themes.Semi/Controls/NavMenu.axaml
index 9f8a54a..80bcd24 100644
--- a/src/Ursa.Themes.Semi/Controls/NavMenu.axaml
+++ b/src/Ursa.Themes.Semi/Controls/NavMenu.axaml
@@ -84,7 +84,7 @@
                     <ContentPresenter
                         Name="PART_HeaderPresenter"
                         Grid.Column="1"
-                        Padding="0,8"
+                        Padding="0,8, 8, 8"
                         Background="Transparent"
                         Content="{Binding Header, RelativeSource={RelativeSource TemplatedParent}}"
                         ContentTemplate="{Binding HeaderTemplate, RelativeSource={RelativeSource TemplatedParent}}" />
@@ -92,12 +92,12 @@
                         Name="PART_ExpanderIcon"
                         Grid.Column="2"
                         Theme="{StaticResource InnerPathIcon}"
-                        Margin="12,0"
+                        Margin="4,0, 8 0"
                         Data="{DynamicResource NavigationMenuItemExpandIconGlyph}"
                         Foreground="{DynamicResource NavigationMenuItemExpandIconForeground}">
                         <PathIcon.Transitions>
                             <Transitions>
-                                <TransformOperationsTransition Property="RenderTransform" Duration="0.1" />
+                                <TransformOperationsTransition Property="RenderTransform" Duration="0.2" />
                             </Transitions>
                         </PathIcon.Transitions>
                     </PathIcon>
@@ -121,21 +121,30 @@
                     </Popup>
                 </Grid>
             </Border>
-            <ItemsPresenter
-                Name="PART_ItemsPresenter"
-                Grid.Row="1"
-                Margin="0,4,0,0"
-                VerticalAlignment="Top"
-                Grid.IsSharedSizeScope="True"
-                ItemsPanel="{Binding ItemsPanel, RelativeSource={RelativeSource TemplatedParent}}"
-                RenderTransformOrigin="0.5,0">
-                <ItemsPresenter.Transitions>
+            <LayoutTransformControl Grid.Row="1" RenderTransformOrigin="0.5,0">
+                <ItemsPresenter
+                    Name="PART_ItemsPresenter"
+                    Grid.Row="1"
+                    Margin="0,4,0,0"
+                    Opacity="1"
+                    VerticalAlignment="Top"
+                    Grid.IsSharedSizeScope="True"
+                    ItemsPanel="{Binding ItemsPanel, RelativeSource={RelativeSource TemplatedParent}}"
+                    RenderTransformOrigin="0.5,0">
+                    <ItemsPresenter.Transitions>
+                        <Transitions>
+                            <DoubleTransition Easing="QuadraticEaseIn" Property="Height" Duration="0.25" />
+                            <DoubleTransition Easing="QuadraticEaseOut" Property="Opacity" Duration="0.25" />
+                            <TransformOperationsTransition Easing="QuadraticEaseInOut" Property="RenderTransform" Duration="0.25" />
+                        </Transitions>
+                    </ItemsPresenter.Transitions>
+                </ItemsPresenter>
+                <LayoutTransformControl.Transitions>
                     <Transitions>
-                        <DoubleTransition Property="Height" Duration="0.1" />
-                        <TransformOperationsTransition Property="RenderTransform" Duration="0.1" />
+                        <TransformOperationsTransition Easing="QuadraticEaseInOut" Property="LayoutTransform" Duration="0.15" Delay="0.1" />
                     </Transitions>
-                </ItemsPresenter.Transitions>
-            </ItemsPresenter>
+                </LayoutTransformControl.Transitions>
+            </LayoutTransformControl>
         </Grid>
     </ControlTemplate>
     <ControlTheme x:Key="{x:Type u:NavMenuItem}" TargetType="u:NavMenuItem">
@@ -157,7 +166,11 @@
         </Style>
         <Style Selector="^:vertical-collapsed /template/ ItemsPresenter#PART_ItemsPresenter">
             <Setter Property="Height" Value="0" />
-            <Setter Property="RenderTransform" Value="scale(1,0)" />
+            <Setter Property="Opacity" Value="0" />
+            <!--<Setter Property="RenderTransform" Value="scale(1,0.9)" />-->
+        </Style>
+        <Style Selector="^:vertical-collapsed /template/ LayoutTransformControl">
+            <Setter Property="LayoutTransform" Value="scale(1,0)" />
         </Style>
         <Style Selector="^:vertical-collapsed /template/ PathIcon#PART_ExpanderIcon">
             <Setter Property="RenderTransform" Value="rotate(180deg)" />
@@ -203,7 +216,7 @@
         </Style>
         <Style Selector="^:horizontal-collapsed:not(:first-level)">
             <Style Selector="^ /template/ PathIcon#PART_ExpanderIcon">
-                <Setter Property="RenderTransform" Value="rotate(-90deg)" />
+                <Setter Property="RenderTransform" Value="rotate(90deg)" />
             </Style>
         </Style>
         <Style Selector="^:horizontal-collapsed:first-level">
diff --git a/src/Ursa.Themes.Semi/Themes/Shared/NavigationMenu.axaml b/src/Ursa.Themes.Semi/Themes/Shared/NavigationMenu.axaml
index e6de440..0a48ece 100644
--- a/src/Ursa.Themes.Semi/Themes/Shared/NavigationMenu.axaml
+++ b/src/Ursa.Themes.Semi/Themes/Shared/NavigationMenu.axaml
@@ -1,7 +1,7 @@
 <ResourceDictionary
     xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-    <StaticResource x:Key="NavigationMenuItemExpandIconGlyph" ResourceKey="SemiIconChevronDown" />
+    <StaticResource x:Key="NavigationMenuItemExpandIconGlyph" ResourceKey="SemiIconChevronUp" />
 
     <x:Double x:Key="NavigationMenuExpandWidth">260</x:Double>
     <x:Double x:Key="NavigationMenuClosedWidth">80</x:Double>