I don’t understand what’s wrong, why I can see those lateral faces ( the front face is there ) of that wall. I tried recalculating the normals, all the faces are blue but it’s seems that it’s not working at all…
For example, the one from right should be hidden and yet I can see it through the entire wall when looking from that angle.
Please share the file if that doesn’t work, psychic abilities only go so far. As a new user you won’t be able to upload here, but you can upload to pasteall.org/blend and post a link here.