After two weeks testing the millions setup combinations, today I have discovered the reason why the segment page was not activating when I entered into a segment: if you ride a course you cant ride a segment. So, Climb Pro and Segment pages are incompatible.
Don't know if its a bug or Garmin has a good reason to force me to choose between riding a course or a segment, but in this case, they could at least document it in the user manual.and save me a lot of headaches and questions in forums..
And thank goodness they are Garmin Connect segment !!! I imagine that with strava it might be even worse.