try NavBar

Apollon.WPF/Views/Components/NavBarPreparationView.xaml

@@ -1,4 +1,4 @@
-<UserControl x:Class="Apollon.WPF.Views.Components.NavBarView"
+<UserControl x:Class="Apollon.WPF.Views.Components.NavBarPreparationView"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
@@ -7,7 +7,18 @@
              xmlns:iconPacks="http://metro.mahapps.com/winfx/xaml/iconpacks"
              mc:Ignorable="d" 
              d:DesignHeight="450" d:DesignWidth="800">
-    <Grid>  
+    <Grid>
+        <StackPanel>
+            <Button Width="35"
+                Height="35"
+                Background="Transparent"
+                BorderThickness="0"
+                Command="{Binding NavigateOverviewCommand}">
+                <iconPacks:PackIconMaterial Kind="ArrowLeft"
+                                        Height="25"
+                                        Width="35"
+                                        Foreground="#0000a0"/>
+            </Button>
             <Menu Height="450"
                   Background="Transparent"
                   Margin="0,20,0,0">
@@ -65,7 +76,7 @@
                                          HorizontalAlignment="Center"
                                                     VerticalAlignment="Center"/>
                         </MenuItem.Icon>
-                    </MenuItem>                    
+                    </MenuItem>
                     <MenuItem Header="Teilnehmer setzen"
                               Template="{StaticResource Item_Template}">
                         <MenuItem.Icon>
@@ -76,7 +87,7 @@
                                          HorizontalAlignment="Center"
                                                     VerticalAlignment="Center"/>
                         </MenuItem.Icon>
-                    </MenuItem>   
+                    </MenuItem>
                 </MenuItem>
                 <MenuItem Header="Daten"
                           Template="{StaticResource Menu_SubMenu_Template }"
@@ -362,7 +373,7 @@
                         </MenuItem.Icon>
                     </MenuItem>
                 </MenuItem>
-            </Menu>            
-           
+            </Menu>
+        </StackPanel>
     </Grid>
 </UserControl>

Apollon.WPF/Views/Components/NavBarPreparationView.xaml.cs

@@ -18,9 +18,9 @@ namespace Apollon.WPF.Views.Components
     /// <summary>
     /// Interaction logic for NavBarView.xaml
     /// </summary>
-    public partial class NavBarView : UserControl
+    public partial class NavBarPreparationView : UserControl
     {
-        public NavBarView()
+        public NavBarPreparationView()
         {
             InitializeComponent();
         }

Apollon.WPF/Views/Components/OverviewDetails.xaml

@@ -289,7 +289,7 @@
                     Width="150"
                     Margin="10"
                     Cursor="Hand"
-                    Command="{Binding NavigateTournamentDetailsCommand}">
+                    Command="{Binding NavigatePreparationCommand}">
                  <Button.Style>                     
                         <Style TargetType="Button" BasedOn="{StaticResource ModernButton}">
                             <Setter Property="Visibility" Value="Hidden"/>