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
Custom layouts are a feature of the upcoming Visual Studio 2015. Users will be able to save a selection of custom layouts and save/load these.
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: