Looks like it’s mentioned at the link below. So it is an older change and this likely on purpose since it’s still that way. It’s worth complaining to Wahoo support about it.
I still don’t know how to downgrade or if it’s even possible.
You could always toggle between the map and climb screens. Not ideal, but workable. Or throw money at the problem and get a ROAM.
What is your use case that you need them on the same screen?