Litght leakage

There are only one Directional light in my scene. And almost every corner leaking light. And in my baked scene, light leaked also. How can I fix this?

In this scene . Only one Directional light .

This is my baked scene. On the left-top wall ,you can see a line of light.

Play with the light’s bias settings.

Also, it looks to me like your ceiling doesn’t have thickness? Adding some will help.

(you can also look into assets that change how the shadows work, there are a couple, but they’re not free)

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Thanks for reply. I tried my light bias settings. It always fix one direction, leaking on the other direction.
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Where I can change how the shadows works?

Maybe try setting the cast shadow setting on your meshes to two sided.