Can I hide or protect parts of page (or a modular page) that is accessible for everyone?
Content open for every visitor to read {% if logged_in %}except for this classified string of text here {% end_if %} and we are back to the open stuff again.
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In Twig that would work if logged_inwas set to true (and the statement was closed by endif). Are you thinking of protecting content in the Markdown, or in Twig?