Say I have Views A, B and C. A is baselined to C. C is then set to GONE. Is there a way in XML to change A's baseline alignment to B in that scenario? (edited)  Like a 

app:gone_baseline="some_other_view_than_this_one"

You could look at doing it programmatically, but I’m not sure that would be the best route. Is it possible that both A and C should have some relationship with B so when C is gone A falls back to B? Barriers sound like another possibile solution https://constraintlayout.com/basics/barriers.html

How about using Guideline in Constraintlayout? View A -> Guideline, View C -> Guideline?

Guidelines work if you want some pre-defined grid (which is typically enough). Barriers are nice when you want two or more views to determine the maximum width/height of an area. I’ve only used barriers a few times though so could be butchering that explanation

I accomplished it programmatically.