All cards on my trello board have closed. How do I get them to be visible again?

[cathy]

I somehow closed all my trello cards.  All that is showing is there are four cards under a specific heading.  How do I make all the cards on the board visible again?

[Michael Pryor · Accepted solution]

There is a way to “filter” for cards with certain criteria and this can be triggered (and turned off) using the “f” key. I bet your filter is on. If you hit “f” it will turn off. 

[Russ Allen]

Thank you so much!  I hit "F", the card filter popped up, I cleared the search term, and all my cards came back.