In MS Visual Studio Express 2013 for Windows Desktop:
I\'m learning C# and following an example that shows how to create a user interface in a .xaml file. https://ms
I know this is an old topic but my solution might help someone in the future.
I ran into the same problem with Visual Studio 2015 Community on Windows 7, where one of my xamarin android project's xaml files stopped showing the Designer tab below the XAML code, the other day.
I tried all the given solutions with no effect however, following in the footsteps of @Waqas, i found out that "Use quadrant based layout" was unchecked while other checkboxes were ticked. To summarize:
VS 2015 community>Tools>Option>XAML Designer> check Use quadrant based layout
I then quit and restarted Visual Studio to find out the Designer tab to be there at the bottom left of the XAML code, alongside the Source tab. HTH.