Fixed DeleteWindow and allowed it to close.

PcgsInvUi/Views/MainWindow.axaml

@@ -5,8 +5,7 @@
         xmlns:viewModels="clr-namespace:PcgsInvUi.ViewModels"
         mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
         x:Class="PcgsInvUi.Views.MainWindow" x:DataType="viewModels:MainWindowViewModel"
-        Title="Main Window"
-        WindowStartupLocation="CenterOwner">
+        Title="Main Window" WindowStartupLocation="CenterScreen" WindowState="Maximized" >
     <SplitView IsPaneOpen="True"
                DisplayMode="Inline"
                PanePlacement="Right">