There's no native feature that would allow you to collapse lists, but there is a chrome extension: https://chrome.google.com/webstore/detail/collapsible-trello-lists/kejemfjfgoaekplmemlkjljcfloiemho?hl=en
Congratulations to @Laura Holton , our latest winner of Taco Tuesday! And thanks to @Kristján Geir Mathiesen for sharing the picture of Taco having fun with his new friend B...
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