Removing words from vocabulary list but not from known words

Over the months I have clicked on several french words that I already know and somehow added them to my learning words list. Is there any way to remove them from the list without removing them from known words? When I removed a bunch my number of words know dropped by 50…

I found how to do this after much testing.

  1. Mark the word as non counted or ignored

  2. click again on the word and mark as known