I see there is some confusion on deleting of furniture designs. There isn’t a delete button or a trash anywhere in the UI.
You cannot directly delete a furniture design.
Why is this so? It’s because there may be existing instances of this design somewhere in the world, or in your inventory, or in some chest far away.
If you deleted the design, they would all turn into some other random type of furniture, or even make the game crash (due to the way furniture is implemented internally). We don’t want to do that.
So how do you get rid of a design you don’t want?
Move it to Uncategorized set. As soon as the game detects there are no more instances of this furniture used anywhere else, it will delete it automatically.
I know this is not 100% intuitive, but it was the best I could come up at the time. Maybe there should be a delete button that would tell you “Cannot delete because there are N instances of this design used in the world” instead? Would that be any better?