Currently, the option doesn't exist in customization wizard yet (the styles team are working hard to make all the options available!) so you'll have to do it by advance customizations. One way to do it:

1. Go to upgrade your account to Paid (it'll reset once open beta launches).
2. Go to Advance Customizations > Your Layers.
3. If you have Negatives, find Auto-generated Customizations under it & click edit. If you have Zesty, find Auto-generated Customizations under it & click edit.
4. Enter set use_journalstyle_entry_page=false; & click save & compile.

And you should see see your comment pages in the site scheme and not in your journal's style.