I'm an absolute beginner in Blender.
I installed Blender 2.79, when I want to create a new 2D animation file I couldn't perform this task.
I googled a lot but I couldn't find where is the problem.
I'm using Windows 10 - 32bit
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That is normal behavior. Blender uses a template file, and to create a new document is to reload the template file. From the manual: "New (Ctrl-N): Clears the current scene and loads startup.blend."
Blender 2.79 is not the most recent release, and more recent releases of Blender have changed the phrasing of this menu option and it now gives a choice of templates.
Read Blender manual first to learn i.a. editors should you need any modifications. You can add custom layouts with the "+".