Thumbs up or down voting makes ratings easier and should encourage agents to vote more.
From Setup, go to Enable thumbs up or down voting for article.and select
If articles already have star ratings when thumbs up or down voting is activated, their previous votes are retained. Three, four, or five stars convert to thumbs up. One and two stars convert to thumbs down. If thumbs up or down is converted back to stars, thumbs up equals five stars and thumbs down equals one star.
Knowledge users vote on the Article Detail page. If a user votes thumbs up, it shows up green. If a user votes thumbs down, it shows up red.
Votes are shown in article detail page based on the current channel and the article search list shows total votes across all channels.