I am working with C#(WPF) and when I open XAML file it splits to Vertical every time, I\'m changing to Horizontal, but when I reopen again
XAML
Vertical
Horizontal
This is late answer, since this feature is available on Visual Studio 2015. For setting the Xaml code view to Vertical or Horizontal you can see steps below:
Visual Studio 2015
Xaml