I've changed my HR zones to be based off of HRR but it hasn't changed on the watch. Why?

I heard on the Running Channel that I should be taking my HR zones off of the HRR method instead of the default Garmin zones. I was able to change it in the Garmin Connect App but it hasn't changed on my watch. I can also find it on my watch but when I go into a run there is no change. Why?