When drafting new content, you can add protection rules or custom “content restricted” messages right from the post editor. Click on the Constellation icon from your editing bar, and you’ll be able to add new rules, or manage custom messages.
When managing rules, you can choose to force this content to always be public, or to protect it so it’s only available to members.
Any new rules added while managing content will be reflected in your plans page when you save your changes.