ClimbPro question

Hi all

Can someone please explain the ClimbPro feature to me?
I created a route on Garmin Connect and turned on ClimbPro during navigation which enabled the ClimbPro screen and showed me how long till the next climb and the extra info during the climb. I expected the watch to automatically switch to the screen at the start of an ascent but had to manually select the ClimbPro data screen to see it..
Is the watch supposed to do this and did I experience a bug or were my expectations wrong and do you need to manually select the screen in order to get the ClimbPro info?