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Checking and unchecking the Preview box above the ACR preview shows you the before and after…
That's all there is—unless you use Snapshots in ACR..
Each adjusment panel in ACR has a Preview box you can check or uncheck to view the adjustments you have made in that panel.
Alternatively, you can simply toggle the "p" key to see the difference in your image before and after the adjustments. But in either case, this before/after comparison is limired to the adjustments made only in the panel you are currently working in.
However, if you switch to the Presets panel and toggle the "p" key, this will show you the difference between the image as it was initially opened in ACR and after all adjustments made in all panels.
Thank you all. That's all clear for me now.