Is there such option? In calibre (I know its completely different tool) you can search/filter books by selecting specific tag or value or whats important for me NOT having certain tag.
I’m afraid there is no way to filter on books that do not have a certain tag. A more in-depth filter system to create such filters and more is on our ideas list though. I do not have a workaround for your request at this time though.
Thanks for your response. If this is already in plans that’s great info 
I gotta say it’s on the ideas list, I can’t make promises here right now though
Sure! Didn’t expect it today 
Thanks for amazing software!