Fix Low Poly Shadows in Unity
The default shadow settings in the Unity Universal Render Pipeline do not look very good for low poly objects. Here’s a simple fix that seems to work quite well.
Open up your project settings (Edit > Project Settings) and select the Graphics section.
Double click on the item in your Scriptable Render Pipeline Settings field (UniversalRP-HighQuality in my case)
Click on the Inspector tab to view the settings
Find the Shadows section
Turn the Normal Bias down to 0
Your shadows should look much better now!