I'm trying to apply the modifier to the closet and the window you see in the screenshot (I'm actually following a tutorial so he might have different settings, but I didn't manage to solve my issue). The modifier works just fine on the bed frame though.
What is also strange is that if I try to change any settings, or even apply them without copying from the bed frame, they don't get applied to the window or the closet. The Auto Smooth is set to $180°$, and if I try to change it I see the difference only if I go below a specific range, like it's the same between $90°$ and $°180$, and only below $90°$ it changes.
I already tried applying the scale, and re-make them again, but nothing worked. At this point, I have no idea about what I should do.
This is how it should look: