Where is the setting for opening full screen video gone?

Hi @christianj. At Ring, we are always working to improve the Ring app and your experience with Ring. This feature from 2019 has been updated and is no longer available. I would recommend checking out Rich Notifications, as this might be a feature that could work for you. You can learn more about Rich Notifications here. Also, if you have a Echo Show, you can configure that device to automatically show Live View once a Ring event or motion is detected. I hope this helps!