MainWindow.xaml

<Window x:Class="ImageViewerFolder.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:ImageViewerFolder"
        mc:Ignorable="d"
        Title="iCloud Live Photos Remover" Height="470" Width="800"
        ResizeMode="CanMinimize">
    <Grid Margin="10">

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <StackPanel Grid.Column="0">
            <!--Folder browse button-->
            <StackPanel Margin="5,5,5,5" Orientation="Horizontal" Height="40" Background="White">
                <Label  Height="auto" Content="Choose folder:" VerticalAlignment="Center"/>
                <Label  x:Name="FolderDir" Height="auto" MaxWidth="180" VerticalAlignment="Center"/>    <!--fixed overflowing text box also: do this properly-->
                <Button x:Name="BrowseButton" Height="25" Width="50" Content="Browse"  Click="BrowseButton_Click"/>
                <Button x:Name="RemoveButton" Height="25" Width="50" Content="Remove"  Click="RemoveButton_Click" Margin="5,0,0,0" Visibility="Visible"/>
            </StackPanel>

            <!--Folder items list-->

            <ListBox Margin="5,5,5,5" Height="330" x:Name="DirBox" SelectionChanged="DirBox_SelectionChanged"/>

            <StackPanel Orientation="Horizontal" Margin="5,0,0,0">
                <Label Content="Search in: "/>
                <RadioButton Content="Root folder only" VerticalAlignment="Center" Margin="5,5,5,5" IsChecked="True" x:Name="RootOnly" Click="RootOnly_Click"/>
                <RadioButton Content="Root and subfolders" VerticalAlignment="Center" Margin="5,5,5,5" x:Name="RootSub" Click="RootSub_Click"/>
            </StackPanel>

        </StackPanel>

        <Image Grid.Column="1" Margin="5,5,5,5" x:Name="ImgBox"/>

    </Grid>
</Window>