Since iOS 12 and macOS 10.14 Mojave, Apple has supported Group FaceTime, which lets you have a video call with up to 32 people. However, as has become painfully obvious in today’s era of non-stop videoconferencing, Group FaceTime has a feature that some find obnoxious: automatic speaking prominence that causes the video tile for the speaker to grow and move around. Happily, Apple finally took the feedback and added options to disable that feature in iOS 13.5, iPadOS 13.5, and macOS 10.15.5 Catalina. In iOS and iPadOS, disable the Speaking option under Automatic Prominence in Settings > FaceTime; on the Mac, look in FaceTime > Preferences.
A serious bug has been discovered in Apple’s Group FaceTime multi-person video chat technology. It allows someone to call you via FaceTime and then, with just a few simple steps, listen in on audio from your iPhone, iPad, or Mac while the call is ringing, before you have accepted or rejected it. To prevent the problem from being exploited, Apple says it has disabled Group FaceTime and promises a fix “later this week.”
In the meantime, if you’re still concerned (there were some reports of people being able to invoke the bug even after Apple disabled Group FaceTime), we recommend turning off FaceTime entirely in Settings > FaceTime in iOS and by launching the FaceTime app in macOS and then choosing FaceTime > Turn FaceTime Off. (Or just be quiet when a FaceTime call comes in.) Apple may be able to fix the problem without requiring users to update software; if iOS and macOS updates do prove to be necessary, we recommend that you install them sooner rather than later.