The picker was one dropdown, so a photo lived in exactly one place. The three
destinations are now independent checkboxes on the card, and the column holds
the set as a comma list — the landing page draws a photo in every section it
was ticked into, each still picking one of its own at random per visit.
Ticking nothing is what `off` used to be: the row is kept and the landing page
stops drawing it, which is what the old "not on the landing page" option did.
3dtours
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