ProjectKnyazevaAvtoriz/NewFolder1/AuthPage.xaml

<Page x:Class="Проект_КнязеваАвторизация.NewFolder1.AuthPage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:Проект_КнязеваАвторизация.NewFolder1"
      mc:Ignorable="d" 
      d:DesignHeight="300" d:DesignWidth="300"
      Title="Авторизация">

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="61*"/>
            <ColumnDefinition Width="14*"/>
        </Grid.ColumnDefinitions>
        <TextBox HorizontalAlignment="Left" Height="26" Margin="93,21,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120"/>
        <Label Content="Логин" HorizontalAlignment="Left" Margin="19,21,0,0" VerticalAlignment="Top" Background="White" Width="51"/>
        <Label Content="Пароль" HorizontalAlignment="Left" Margin="19,64,0,0" VerticalAlignment="Top" Background="White"/>
        <PasswordBox HorizontalAlignment="Left" Margin="93,64,0,0" VerticalAlignment="Top" Width="120" Height="26"/>
        <Button Content="Вход" HorizontalAlignment="Left" Margin="117,108,0,0" VerticalAlignment="Top" Width="75"/>
        <Button Content="Регистрация" HorizontalAlignment="Left" Margin="117,141,0,0" VerticalAlignment="Top" Width="75"/>

    </Grid>
</Page>