PMPro offers a setting to filter and hide members-only content in your site’s blog, archives and search results. You can select this option on the Memberships > Settings > Advanced Settings page.
If you’re using the Custom Post Type Membership Access Add On, you can apply this same setting to CPTs with a custom filter using the
pmpro_search_filter_post_types hook. Thank you to @topher1kenobe for creating this recipe.