If you mean the baked shadows that appear on your map next to your objects, then you can use a tool called Taliis to remove them.
If you mean the shadow that appear next to you when you turn Shadow Quality up, then you can turn it down.
If you mean the shadows that appear while taking a solitary stroll through the forest at midnight, then I can't help you there. I'd suggest looking behind you and preparing to run like fuck away from some paranormal entity from
this website, though.