How do I use the new "Ignore" feature on the Classic Review

Right under the “check answer” and blooming flower there is a lightning bolt and a minus sign. The lightning bolt is to add the word to your difficult list and the minus sign is to ignore the word.

I don’t know if I want to ignore the word until I have typed it and checked it. At this point, I have a second or less to hit that minus sign. So I’m not sure if I’m ignoring the word I just did or if I’ve accidentally ignored the next word.

I’ve looked for instructions on your new features and can’t find any.