Actually, lowering the value does fix this, but at the cost of having shadows across your landscape and foliage disappear. Instead, what you can do is increase the number of shadow cascades. This will help keep the shadows sharp at all distances. If you first double the number of cascades to 6, you’ll see that all of a sudden the shadows that were blurry are now crisp. Then, if you need it, increasing the Dynamic Shadow Distance will cost more, but it will also make sure you can see shadows on distant foliage and landscape scenery.