Sharpen shadows on a direct static light

Hello.
Can anybody help me with this ugly and sharpen shadows casting by my sun?

By the way, taking a screnshot is the only way to make a static render, or is there another way to do it.

Thank you!

Increase lightmap resolution of the floor and the walls(decrease the value if it they are BSP’s.)
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Wow! So easy!
Thank you so much!