presence/Presence.Desktop/Views/MainWindow.axaml

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:vm="using:Presence.Desktop.ViewModels"
        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="Presence.Desktop.Views.MainWindow"
        Icon="/Assets/avalonia-logo.ico"
        Title="Presence.Desktop"
        x:DataType="vm:MainWindowViewModel"
		xmlns:local="clr-namespace:Presence.Desktop.ViewModels"
        DataContext="{Binding RelativeSource={RelativeSource Self}}">

	<DockPanel Background="White">
		<!-- Верхняя панель с комбобоксами -->
		<StackPanel DockPanel.Dock="Top" HorizontalAlignment="Center" Margin="20">
			<!-- Первый ComboBox для выбора группы -->
			<ComboBox Foreground="Black" ItemsSource="{Binding Groups}" SelectedValue="{Binding SelectedGroupItem}" HorizontalAlignment="Center" Width="300" Margin="5">
				<ComboBox.ItemTemplate>
					<DataTemplate>
						<TextBlock Text="{Binding Name}" />
					</DataTemplate>
				</ComboBox.ItemTemplate>
			</ComboBox>

			<!-- Второй ComboBox для выбора способа сортировки -->
			<ComboBox Foreground="Black" ItemsSource="{Binding SortOptions}" SelectedItem="{Binding SelectedSortOption}" HorizontalAlignment="Center" Width="300" Margin="10">
				<ComboBox.ItemTemplate>
					<DataTemplate>
						<TextBlock Text="{Binding}" />
					</DataTemplate>
				</ComboBox.ItemTemplate>
			</ComboBox>
			<StackPanel DockPanel.Dock="Bottom" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="20">
				<Button Foreground="Black" Content="Удалить всех студентов" Command="{Binding RemoveAllStudentsCommand}" HorizontalAlignment="Center" Width="250" Margin="10"/>
				<Button Foreground="Black" Content="Добавить студента" Command="{Binding AddStudentCommand}" HorizontalAlignment="Center" Width="250" Margin="10"/>
			</StackPanel>
		</StackPanel>

		<!-- Центральная панель для списка студентов -->
		<ListBox ItemsSource="{Binding Users}"
				 HorizontalAlignment="Center"
				 Width="350"
				 Background="Bisque"
				 Margin="10"
				 SelectionMode="Multiple"
				 SelectedItems="{Binding SelectedUsers}">
			<ListBox.ItemTemplate>
				<DataTemplate>
					<StackPanel Orientation="Horizontal" Margin="5">
						<TextBlock Foreground="Black" Text="{Binding Name}" VerticalAlignment="Center" />
					</StackPanel>
				</DataTemplate>
			</ListBox.ItemTemplate>

			<ListBox.ContextMenu>
				<ContextMenu>
					<MenuItem Header="Удалить" Click="OnDeleteUserClick"/>
					<MenuItem Header="Редактировать" Click="OnEditUserClick"/>
				</ContextMenu>
			</ListBox.ContextMenu>
		</ListBox>
	</DockPanel>
</Window>