This happens to me too, and I don’t remember clicking on anything. When I try to zoom in onto the board, it just gets smaller! I am using safari on a iPhone 11.
Chat got too big, board got too small
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Was the site updated? This happened twice to me in 2 days: I accidentally clicked somewhere that made the chat appear much larger and the board much smaller. I can't find a way to change it back to normal proportions.