MainWindow.xaml

<Window x:Class="H_Writes.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:H_Writes"
        mc:Ignorable="d"
        Title="MainWindow" WindowStyle="None" WindowState="Maximized">
    <Window.Resources>
        <Style x:Key="NoCaretTextBoxStyle" TargetType="TextBox">
            <Setter Property="CaretBrush" Value="Transparent" />
        </Style>
    </Window.Resources>
    <Grid Background="Black">
        <TextBox x:Name="TextInput" Width="1000" VerticalAlignment="Center" HorizontalAlignment="Center"
                 FontSize="80" Background="Black" Foreground="White" BorderThickness="0" FlowDirection="RightToLeft"
                 TextAlignment="Center" AcceptsReturn="True" TextWrapping="Wrap" KeyUp="TextInput_KeyUp"
                 IsReadOnlyCaretVisible="False"  />
    </Grid>
</Window>