Почему Gridsplitter обрезает textbox

У меня есть 2 грида и текстбоксы, и они обрезаются gridsplitter до того, как он закрывает их, как это исправить?

<Window x:Class="Films.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Films"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="17*" MinWidth="100" MaxWidth="746"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <Grid x:Name="MainGrid"
              Grid.Column="0" 
              Height="Auto">
            <Button Content="Acscess" Width="76" x:Name="Autorization" VerticalAlignment="Center" HorizontalAlignment="Center" />
            <Button Content="Go by Guest" Width="76" x:Name="Guest" VerticalAlignment="Center" HorizontalAlignment="Center" Margin="0,70,0,0"/>
            <TextBox Text="TextBox" Height="34" Width="171" Margin="0,0,0,150" FontSize="20" VerticalAlignment="Center" HorizontalAlignment="Center"/>
            <PasswordBox Width="136" Height="25" VerticalAlignment="Center" HorizontalAlignment="Center" Margin="0,0,0,79"/>
        </Grid>

        <GridSplitter x:Name="Splinter" Grid.Column="0" Width="4" Height="Auto" HorizontalAlignment="Right" Margin="0,1,2,0" >
            <GridSplitter.Effect>
                <DropShadowEffect Direction="152" BlurRadius="10" ShadowDepth="2" Color="Gray" Opacity="1"></DropShadowEffect>
            </GridSplitter.Effect>
        </GridSplitter>

        <Grid x:Name="SettingsGrid"
              Grid.Column="1" 
              Height="Auto" HorizontalAlignment="Stretch">
            <Button Width="Auto" VerticalAlignment="Top" HorizontalAlignment="Stretch"
                    Height="40">
                <Image Source="C:\Users\gzaly\OneDrive\Рабочий стол\Visual Projects\Films\Films\Pictures\Settings.png" VerticalAlignment="Stretch" HorizontalAlignment="Stretch">

                </Image>
                <Button.Resources>
                    <Style TargetType="Border">
                        <Setter Property="CornerRadius" Value="15"/>
                    </Style>
                </Button.Resources>
            </Button>
        </Grid>

    </Grid>

</Window>