To remove V11 tags, see this: Why do I still have V11 tags in V12?
To remove V11 cards that are not apart of V12 anymore, see this: How do I delete all V11 cards after I have upgraded to V12?
To remove V11 tags, see this: Why do I still have V11 tags in V12?
To remove V11 cards that are not apart of V12 anymore, see this: How do I delete all V11 cards after I have upgraded to V12?