@jj-frl For the first topic, you simply do not.
This is not a problem for me, as when I’m doing an activity, I’m busy doing the activity so I’m not going to interrupt my running, weightlifting, etc. to do something else like check the weather. If I’m done with my activity, then I end it and then can use other features of the watch. The only time this might be relevant for me is if I’m going for a walk which is low effort, and there, I will have my iPhone with me so would use that for other things.
I don’t understand the second question. What exactly is displayed in green/red? The “trace line” of your run for me is in red not green. Can you show a photo? Anyway, I suspect there’s not a way to change what you’re seeing.