Edit Xaml files on debuging Visual studio 2019, WPF

I want to Edit UI XAML files with my program running and see these changes without to stop my program...

When I change these files right now It just o nothing until I close my program and start again.

For exmaple: this is my xaml code:

<Window x:Class="WpfApp4.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:WpfApp4"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>

    </Grid>
</Window>

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I see an empty white screen

When I change it (on debug) to

<Window x:Class="WpfApp4.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:WpfApp4"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800" Background="Blue">
    <Grid>

    </Grid>
</Window>

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Nothing is change

But when I restart my program It runs this blue screen... http://prntscr.com/nwiwiw

I think its something about debugging option? this is my page open list

http://prntscr.com/nwiwtu