Milo's suggestion will work to an extent, but as soon as you open one of those policy pages the sidebar will display the page hierarchy.
However, you can disable the display of either page tree or child pages navigation (via "Configure Side" in the bottom-left of the screen). You may then either need to manually create your navigation structure or use wiki markup via a custom sidebar element (via Space Tools > Look and Feel > Sidebar, header and footer) to recreate it in some way.
BTW it would help to understand the outcome you are trying to achieve by hiding those child pages in the sidebar navigation - we might be able to suggest an alternative approach
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