I’ve found the blood oxygen feature on the Apple Watch to be worthless. The error bars on its measurements must be massive, so I would get numerous measurements every day down in the 80s. Better, finger-tip-based hardware measurements taken at the same time were never below 96%. And I’m careful about wearing the Watch just the way Apple recommends. I ended up just turning the feature off entirely, because I don’t want junk data in my Health history. I actually agree with Masimo’s CEO, who said, “I really feel wholeheartedly that consumers are better off without it."
Live Captions is feature that can be enabled in the Accessibility area of Settings. It puts a small floating box on the screen at all times. Whenever you tap it, it expands to show a few lines of text of whatever audio is playing on the phone. The Live Captions interface is excluded from screenshots, so I can’t post that. Here is a YouTube video I found that shows how it works: https://m.youtube.com/watch?v=ekyMSeHtsrc&t=131s&pp=ygUTaXBob25lIGxpdmUgY2FwdGlvbg%3D%3D