How to change pre-filled local areas?

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This is a great theme and it does something I don't understand: when I add a Blog page , the right sidebar is already filled in, with 2 pagelists (even though these areas are not global!). Also there's a social media block, whic is fine.

The two pagelists that are filled in by default are not the type/design I want, and it doesn't filter the right part of the tree.
So: how can I change which default blocks go where myself?

Type: Discussion
Status: New
jiropii
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concrete5 Environment Information

Concrete5.8

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Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36

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