Blender 2.81 bad shadows (missing settings) Seems like new version has no shadow settings. I read that new version should calculate and make setting automatically for better results. But it look much worse. Any ideas? 
2.80 
2.81 
Settings:

2.80
2.81
Blender 2.81 has better shadow algorithm, the final result will deliver a higher quality shadow, but it needs more samples in order to get to that result.

Go to the Properties Render tab and in the Sampling panel increase the number of samples.