Hello, the easy way to do if you want to start with a fresh install is to reset you r database with a plugin like Database Reset. You should use it with caution since it will erase your database data like users, posts, pages.
Another way of doing it is by deleting all of the doubled data and also from the trash and to import it again.
If you use this method you need to delete menus, posts, pages and custom posts like Knowledge base articles.
Let me know if that helps
Cheers
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