It should be under selective e.g. you can highlight an area by painting with the brush or other selective radial/gradient tool and then apply noise reduction or sharpening detail to that area.
Selective tools are a premium feature.
I once saw some screenshots online showing the "Details" tab is between "Effect" and "Optics" tabs (a triangle icon). Therefore i don't think it is under Selective tabs. Thanks anyway.
Could the screenshots have been from iOS?
Has Android ever had the detail tab/sharpening?
You can add your vote here:
Although reading the comments it does seem to echo Jon’s selective tab advice (if you have it).