The masking feature has been removed from under 'Details'
The masking feature under 'Details' allowed for better control of sharpening (and also noise reduction). I used it on all my raw image. I has now been removed. Please see the attached print screen. There is no Masking feature under Details. This feature disappeared after I updated to 12.0.0.270. Very disappointed as this really helped reduce work flow. I would like to see back.
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Kukurykus commented
You still can mask using Details sliders. Click a round thing that's over an eye icon on the right vertical bar.
For get more Camera Raw answers go to: https://community.adobe.com/t5/camera-raw/ct-p/ct-camera-raw