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}}">

	<Window.Styles>
		<Style Selector="TextBlock">
			<Setter Property="Foreground" Value="Black"/>
			<Setter Property="FontSize" Value="14"/>
		</Style>
		<Style Selector="ComboBox">
			<Setter Property="Foreground" Value="Black"/>
			<Setter Property="Background" Value="#F0F0F0"/>
			<Setter Property="BorderBrush" Value="#808080"/>
			<Setter Property="BorderThickness" Value="1"/>
			<Setter Property="Padding" Value="5"/>
			<Setter Property="FontSize" Value="14"/>
		</Style>
		<Style Selector="Button">
			<Setter Property="Foreground" Value="White"/>
			<Setter Property="Background" Value="#4CAF50"/>
			<Setter Property="BorderBrush" Value="#4CAF50"/>
			<Setter Property="BorderThickness" Value="1"/>
			<Setter Property="Padding" Value="10"/>
			<Setter Property="FontSize" Value="14"/>
			<Setter Property="CornerRadius" Value="5"/>
		</Style>
		<Style Selector="ListBox">
			<Setter Property="Background" Value="#FFE4C4"/>
			<Setter Property="BorderBrush" Value="#808080"/>
			<Setter Property="BorderThickness" Value="1"/>
			<Setter Property="Padding" Value="10"/>
			<Setter Property="FontSize" Value="14"/>
		</Style>
		<Style Selector="MenuItem">
			<Setter Property="Foreground" Value="Black"/>
			<Setter Property="Background" Value="#F0F0F0"/>
			<Setter Property="BorderBrush" Value="#808080"/>
			<Setter Property="BorderThickness" Value="1"/>
			<Setter Property="Padding" Value="5"/>
			<Setter Property="FontSize" Value="14"/>
		</Style>
	</Window.Styles>

	<DockPanel Background="#F5F5F5">
		<!-- Верхняя панель с комбобоксами -->
		<StackPanel DockPanel.Dock="Top" HorizontalAlignment="Center" Margin="20">
			<!-- Первый ComboBox для выбора группы -->
			<ComboBox 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 ItemsSource="{Binding SortOptions}"
                      SelectedItem="{Binding SelectedSortOption}"
                      HorizontalAlignment="Center"
                      Width="300"
                      Margin="10">
				<ComboBox.ItemTemplate>
					<DataTemplate>
						<TextBlock Text="{Binding}" />
					</DataTemplate>
				</ComboBox.ItemTemplate>
			</ComboBox>
		</StackPanel>

		<!-- Нижняя панель с кнопками -->
		<StackPanel DockPanel.Dock="Bottom"
                    HorizontalAlignment="Center"
                    VerticalAlignment="Center"
                    Margin="20">
			<Button Content="Удалить всех студентов"
                    Command="{Binding RemoveAllStudentsCommand}"
                    HorizontalAlignment="Center"
                    Width="250"
                    Margin="10"/>
			<Button Content="Добавить студента"
                    Command="{Binding AddStudentCommand}"
                    HorizontalAlignment="Center"
                    Width="250"
                    Margin="10"/>
		</StackPanel>

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