Please correct me if I'm wrong. It seems I can't do other functions (e.g. ECG) during an activity or when broadcasting HR without stopping and saving/discard the activity or stopping broadcasting. In the case of an activity, it must be stopped and saved/discarded. Pausing won't work.
Also, if I view something, like the HR screen, WX, etc., the watch will revert to the watch face after a minute or so without prompting. Is there way to prevent this?