I typed up cards on one of my boards and they seem to be hidden and I don't know how to get them back.
Hi!
Check if you accidentally archived the cards.
For that click on the Show menu button on the right and a menu bar will open.
Under Stickers there is option More and from there choose Archived Items.
@kharveyaycc sounds like you've enabled a filter:
https://help.trello.com/article/787-filtering-search-cards-on-a-board
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