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The Chayey Adam was considered to be the "popular kitzur Shulchan Aruch" for almost a century before the "Kitzur Shulchan Aruch" was printed. Why did people stop learning the Chayey Adam and switch to the Kitzur?
Because the CA only covers (mainly) Orach Chayim whereas KSA covers all four parts of Shulchan Aruch.