The idea: a soft animated rainbow-gradient ring wraps the whole region whose guidance is hidden; no text, no count. A full ring, so it complies with the no-partial-edge-stripe rule, and the drift is slow and pastel (and stops entirely for users with reduced motion set). Pro: impossible to miss and it marks the exact region, with zero vertical space cost. Con: a permanently animated ring keeps pulling the eye and can read as an error or a promotion; with several hidden regions on one page the page shimmers, and the ring says nothing about what or how much is hidden.

The idea: a small muted badge with a count sits at the region's top edge ("2 hidden tips"); clicking it expands the guidance in place. Pro: quiet, honest about how much is hidden, and it scales cleanly when many regions on one page hide guidance. Con: easy to overlook entirely, and "tips" is a word users have to learn; a user who never notices the badge never learns the guidance exists.

The idea: a one-line thin strip with a chevron sits exactly where the guidance would render ("Guidance hidden (2)"); clicking it expands in place. Pro: reads without any learning, carries a count, and the click target is large and exactly where the content appears. Con: it still spends a line per region, so compact density saves less vertical space than the other two; on a page with many hidden regions the strips themselves become clutter.