I play as a second player in split screen, and when I write in a command block, book, etc., the keyboard appears right on top of my screen (second screen), making it impossible for me to see what I'm writing.
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Are you still experiencing this issue in the latest version? Does this affect both players when playing split-screen or only one? There was a recent fix regarding other players who were experiencing similar issues as those described by you, see MCPE-170831.
This might still affect those who are playing on split-screen though, so It'd be nice if you could verify.