Can't find keyboard short cut

I just upgraded to Camera Raw 13.1 from before version 12.3, and the interface is quite different. 

I often use Smart Object layers and open them multiple times in Camera Raw, each time making different tweaks.

Let's say that I opened the image for the first time in Camera Raw and made changes. Then I opened it a second time and made additional changes. Is there a way to toggle the view between the changes made the second time in Camera Raw and the changes made since opening it a second time? That used to be the P key, but now P toggles between the way the image looked the first time it was opened and edited in Camera Raw and all changes made.