Before/After functionality reduced/missing from 12.3?

Updated to ACR 12.3 and I am not thrilled with the new interface, but my main issue is that I cannot figure out how to do something that was quite easy to do with the old interface.  There was a button for “Copy current settings to Before” which made it easy to incrementally view the effect of each individual adjustment when desired.    You could make several adjustments, make all of those settings the “Before” and then move one more slider and then see the before/after for the effect of just that one slider.  I may be missing something, but I cannot find a way to easily do this with the new interface.

How do I accomplish this in 12.3?