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Is it possible to skip a nav group when outputting a navigation?
Is it possible to output a navigation, and exclude a certain nav group?
For example, create a group called 'footer' and skip that group when outputting the navigation in the header.
No, you'd need to create the opposite nav group.
Is it possible to omit a specific link, say the homepage?
Yes, there's a checkbox to hide any page from the navigation.