Hi @Kristine Joy Razon ,
Thanks for posting and welcome to the community.
I think Public board allows to vote and comment but not explicitly viewing activity history - https://help.trello.com/article/789-changing-the-visibility-of-a-board-to-public-private-or-team.
Hi @Kristine Joy Razon, click the "Show details" button on the card back to see the card's activity history. You can see activity on all boards/cards regardless of the board's visibility.
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