The new flag (the red one) is a marker to indicate whether you consider it to be new or not. As Faterson mentions, you can set/unset it manually.
On the other hand, "Opened" is not a flag per se. It is an indicator of whether a book has been opened or not. I'm working on a version that will allow you to reset the opened timestamp, a side effect of which would be that the book will be removed the home screen.
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