When you clone a page layout, you can configure the new layout with one of the following options:
“Make Default Layout” defines the layout as the default. It is this layout that is rendered for anonymous shoppers and registered shoppers.
“Display layout to account shoppers only” restricts the layout to account-based shoppers only.
Using these two settings, you can design a set of layouts for your anonymous and registered shoppers and another set for your account-based shoppers. Note that this may not be required for all layouts; in other words, if a layout does not need different content for the various shoppers types, you can have one default layout for all of them.