The apps don't have the same feature sets as the website and forums is one of those features that has basic functionality.
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there's some bad design, imo about this forum on the chess.com app. first, I can't search my newly created topic automatically, and I have to search it manually. second, when I text a reply, I am only able to write a wall of text and can't separate it into a different paragraph. third, there's no notification when someone replies to me. fourth, can't do "@" thing. note : if someone offended by this, then womp womp to you.