About A~E Tile Sets
A... Land and sea, walls and floors, and all tiles that will be the map's ground.
B... Windows and signs, trees and grass, field-use castles, towers and the like.
C... Stairs, cabinets, beds, and all small, indoor items.
D... Pillars and entrances for caves, statues, and small items for dungeons.
E... Space left empty for the user.
It occurred to me that the A-E tabs on the tilesets might represent layers, or be somewhat linked to layers.
I'm a bit confused that there's a layer button, but no indication whether there are unlimited layers, or as someone suggested you just get a drop-down to select which of the existing 3 layers you want to use.
Don't see buildings in the list there anywhere.