(disclaimer: I work for Netflix. Edit: I should clarify that I wasn't involved with this article in any way)
You can disable the behavior you mentioned. Go to your profile settings, and under "Playback Settings" you can uncheck "Autoplay previews while browsing on all devices".
You can disable the behavior you mentioned. Go to your profile settings, and under "Playback Settings" you can uncheck "Autoplay previews while browsing on all devices".