@YouTube you have a lot of things to fix about yourself, but if I don’t click a video on my feed, that video should NOT play while I scroll through. What’s the deal?
Are you referring to the new feature? If yes, here's how it works: With Autoplay on Home, videos on the Home tab play automatically with no sound and captions enabled. This way you can preview the video while “on-the-go”. Here’s more information: https://goo.gl/2igJzF