If you want to keep your read books but see only the unread ones, you need to use the Yes/No column you already have in Calibre and mark in CC settings that column as the Reading state. You have a specific section in CC settings to do that. Then if you use the grouping settings to see only the books marked as No, you'll only see those books, and you can select the way you want them ordered by default in other part of CC settings.
If you want to only keep the books you haven't read, look for the use of another Calibre plugin, Reading List, in combination with CC. There are some treads in this forum talking about how to use it, I don't use it myself, so I can't help you with that.
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