https://wccftech.com/the-witcher-3-enhanced-graphics-settings/

A new The Witcher 3 mod that unlocks additional graphics presets has been released online.

The Witcher 3 Enhanced Graphics Settings mod add an Extreme preset to several settings such as Shadow Quality, Grass Density, Texture Quality, and Foliage Visibility Range. The new preset does have an impact on performance, but the developer tried to achieve a good balance so that image quality can be visibly improved without making the game unplayable.