Hi Alec,
I see that you’re using a Stationary Directional light. These are both dynamic and static lighting combined. However, you’re not seeing any changes by the dynamic portion of the light with the Shadow Bias and Filter Sharpen because the dynamic portion is off by default. You can change this by scrolling down to the tab Cascaded Shadow Maps. Adjust the Dynamic Shadow Distance Stationary to a value you’re happy with,.
For the shadows that are baked and already present in your scene to get better more correct looking shadows you’ll need to increase the lightmap resolution for the floor mesh where the light and shadow are cast.
You can read more in our Wiki Lighting troubleshooting and tips guide here: A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums
Thank you!
Tim