DemoService/ServiceWindow.axaml

<Window xmlns="https://github.com/avaloniaui"
        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"
        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
        x:Class="DemoService.ServiceWindow"
        Title="Сервис «Подай на 16»">
	<StackPanel Orientation="Vertical">
		<Grid RowDefinitions="Auto"
			  ColumnDefinitions="* Auto Auto">
			<TextBox Grid.Column="0"
					 Watermark="Поиск"/>
			<ComboBox Grid.Column="1">
				<ComboBoxItem>Сортировка</ComboBoxItem>
			</ComboBox>
			<ComboBox Grid.Column="2">
				<ComboBoxItem>Фильтрация</ComboBoxItem>
			</ComboBox>
		</Grid>
		<ListBox>
			<ListBox.ItemTemplate>
				<DataTemplate>
					<Grid RowDefinitions="Auto"
						  ColumnDefinitions="* *">
						<StackPanel Grid.Column="1">
							
						</StackPanel>
					</Grid>
				</DataTemplate>
			</ListBox.ItemTemplate>
		</ListBox>
	</StackPanel>
</Window>