https://wccftech.com/heres-how-you-can-improve-amd-fsr-quality-in-dying-light-2/

In our review of Dying Light 2 Stay Human, we noted that the game's implementation of AMD FidelityFX Super Resolution (FSR) was very blurry and couldn't be compared to the image quality of DLSS in any way.

Reddit user TheHybred (who claims to be a former Ubisoft developer) has found a way to improve that by tweaking the configuration file, though. He notes that Dying Light 2 Stay Human does not offer the usual FSR Ultra Quality preset, and its sharpness value is also set too low.