Working on cropping in camera raw via Bridge, I clicked on a return arrow with dots on the right side panel. The whole screen went black. Unable to turn off the laptop. Unable to see anything to restart or shutdown either. Thank you.

You may have to force-restart the computer. 

Quote from Google’s AI Overview: 

»To restart a crashed or frozen Mac, press and hold the power button (or the Touch ID button on newer models) for about 10 seconds until the screen goes black, then release it. Wait a few seconds, then press the power button again to turn it back on.«

https://eshop.macsales.com/blog/42219-tech-tip-how-to-force-quit-a-macbook-pro-with-touch-bar/?srsltid=AfmBOopebF4JM89GTrISGd-4lqaRg-stt8_9OIGR616nS9Q0aH29hB99