I’ve gone through every light settings in the details panel, but found no fixes for the two other light sources. Source radius seems to be the only one affecting the edges of the shadows, albeit incredibly roughly and unreliably.
Directional Lighting - Smooth, desirable shadows;
Spotlight - Pixelated and rough;
Pointlight - Similar results;
Source Radius effect - Only seems to “roughly” spread the shadows, but doesn’t really soften them;
Any ideas how I could solve this issue?