The Save View Message Box tells you the saving path and the level for which the user-customized view will be saved (for information about the view levels, see Serna View Customization):
Template level. The view will be rendered for any document opened/created with the current template.
No-Template level. The document without template view will be rendered for any document which doesn't have a template-specific view. When no document is opened, you can save the view as the no document view.
To learn how to save the view, see How to Save View.