entrance-testing/EntranseTesting/Views/TestingViews/TestArrangementOfElements.axaml

<UserControl 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="EntranseTesting.TestArrangementOfElements"
             x:DataType="vm:MainWindowViewModel"
             xmlns:vm="using:EntranseTesting.ViewModels">

  <ScrollViewer HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto">
    <StackPanel Margin="20 0" Background="Transparent" Spacing="15"
                HorizontalAlignment="Stretch" VerticalAlignment="Stretch">

      <!-- Задание -->
      <TextBlock Text="{Binding TestMain.TestPages.TestAE.Question}"
                  VerticalAlignment="Top"
                  HorizontalAlignment="Stretch"
                  TextWrapping="Wrap"/>
      <!-- Картинки -->
      <ItemsRepeater ItemsSource="{Binding TestMain.TestPages.TestAE.QImage}"
                             HorizontalAlignment="Stretch"
                             VerticalAlignment="Stretch">
        <ItemsRepeater.Layout>
          <WrapLayout HorizontalSpacing="15" VerticalSpacing="5" Orientation="Horizontal"/>
        </ItemsRepeater.Layout>
        <ItemsRepeater.ItemTemplate>
          <DataTemplate>
            <Image Source="{Binding qImage}" Classes="Test"/>
          </DataTemplate>
        </ItemsRepeater.ItemTemplate>
      </ItemsRepeater>
      <!-- Поля с перетаскиванием -->
      <Grid Name="MainContainer" VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
        <Border DragDrop.AllowDrop="True"
                CornerRadius="5" Background="Transparent" BorderThickness="0" Margin="0 5">
          <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
            <ItemsRepeater ItemsSource="{Binding TestMain.TestPages.TestAE.Element}"
                           VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
              <ItemsRepeater.Layout>
                <StackLayout Spacing="10" Orientation="{Binding TestMain.TestPages.TestAE.StackLayoutOrientation}"/>
              </ItemsRepeater.Layout>
              <ItemsRepeater.ItemTemplate>
                <DataTemplate>
                  <Border PointerPressed="OnPointerPressed"
                          Padding="10 5" Margin="0 0 0 15"
                          Classes="Arrangment"
                          HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
                          Background="#cfd7ff" CornerRadius="5">
                    <TextBlock Text="{Binding Name}"
                               TextAlignment="Center"
                               VerticalAlignment="Center"
                               TextWrapping="Wrap"/>
                  </Border>
                </DataTemplate>
              </ItemsRepeater.ItemTemplate>
            </ItemsRepeater>
          </ScrollViewer>
        </Border>
      </Grid>

      <!-- Полупрозрачный элемент == перетаскиваемому объекту -->
      <Border Name="GhostItem"
              Padding="10 5" CornerRadius="5"
              Classes="Arrangment"
              Background="#cfd7ff" Opacity="0.6"
              HorizontalAlignment="Center" VerticalAlignment="Center">
        <TextBlock Text="{Binding TestMain.TestPages.TestAE.DraggingElementItem.Name, FallbackValue='TEXT'}"
                   Foreground="Black"
                   TextAlignment="Center"
                   TextWrapping="Wrap"
                   VerticalAlignment="Center"
                   MaxWidth="140"/>
      </Border>
    </StackPanel>
  </ScrollViewer>
</UserControl>