Learn how to suppress halos with the Detail Slider when Sharpening in Lightroom
The Detail slider in the Detail panel in Lightroom lets you suppress the haloes you create with the Radius slider.
At zero position you will fully suppress any halos and at 100 you will have no halo suppression so you will see all the halos added using the Detail slider.
This means that a low value for the Detail sider sharpens only the largest edges in the image and a large value for Detail will tend towards sharpening everything.
Hold Alt (Option on the Mac) as you drag on the Detail slider to see the effect on the halos around the edges in the image.
Typically if you use a high Radius value then you will want to use a low value for Detail and vice versa.