[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/KV6qE.png

I don't want to see the shadow cast on the wall like the circled one with red pen the picture. How can I cancel such light effect?

I found an answer that said to go the "word" and "surface" to remove it. I am not sure that it's the same thing (link: https://blender.stackexchange.com/questions/69014/how-do-i-turn-off-environment-world-lighting-in-blender-cycles)

but I did not see the "surface" option in my "world" column.

Thank you for helping me, I really appreciate it