Hi!
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Pages are always publicly accessible (unless they are still in draft status), if they are not supposed to be accessible via URL, they need to be blocked via a route.
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Each overview blueprint (lets say blog, projects etc), can define their own pages sections with allowed blueprints for that subpage, see for example the Starterkit, where you have a
notes
page with subpages that use the blueprintnote
, and aphotography
page with subpagesalbum
. In this example, subpages have only a single blueprint, but could allow multiple.
The 5 overview pages could be show in the site.yml.