In Lightroom Classic an inadvertent key action turns on face recognition and you can't easily stop it. Even though you able to change the action to Paused it doesn't pause - it keeps running. And when you have done it in error on 4000 thousand photos with a deadline looming it is *really* frustrating. There are a few other things that can inadvertently be turned on with no obvious way to turn them off. Please don't do that! Any thing that can be easily turned on should be easily turned off. Please. Please. Please!