oap_labs/MainWindow.xaml

<Window x:Class="wpf_template.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:wpf_template"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    
    <Grid ShowGridLines="True">
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"/>
            <RowDefinition />
            <RowDefinition Height="auto"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="200"/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>


        <Image 
         Source="assets/nagievlogo2.jpg"
         Grid.Row="1"
         Grid.RowSpan="2"/>

        <StackPanel 
        Orientation="Vertical"
        Grid.RowSpan="3"
        Grid.Row="2"
        VerticalAlignment="Bottom">
            <Button 
            x:Name="ExitButton"
            Content="Выход" 
            Click="ExitButton_Click"
            Height="50"/>
        </StackPanel>

        <DataGrid
            Grid.Row="1"
            Grid.Column="1"
            CanUserAddRows="False"
            AutoGenerateColumns="False"
            ItemsSource="{Binding ProductList}">
            <DataGrid.Columns>
                <DataGridTextColumn
                Header="Категория"
                Binding="{Binding Category}"/>
                <DataGridTextColumn
                Header="Компания"
                Binding="{Binding Company}"/>
                <DataGridTextColumn
                Header="Название"
                Binding="{Binding Title}"/>
                <DataGridTextColumn
                Header="Цена"
                Binding="{Binding Price}"/>
            </DataGrid.Columns>
        </DataGrid>

        <WrapPanel
        Orientation="Horizontal"
        Grid.Column="1"
        MinHeight="50
            ">
            <!-- минимальную высоту я тут поставил, чтобы верхнюю строку сетки было видно. В реальном приложении она не нужна -->
        </WrapPanel>
    </Grid>
</Window>