Contents — on the floor or in a wall.
The stuff the party finds. Place it, then click it with Inspect to fill in its details/notes.

Torch — lights a passage; mounted on a wall (wall still blocks).
Alcove — a niche in a wall holding an item; set what's inside.
Chest — full panel: contents, random gold, random item, locked (+key), trapped (+trap type & description).
Item — a floor pick-up (key, gem, a Point); name it.
Interact — statue/shrine/rune/plaque; write what it does.
Decor — cosmetic dressing (bones, slime).
Trap — a floor trap; pick a type (dart, gas, curse...) and describe it.
Pit — a fall; set damage and where it drops them.
Trap door — a floor hole wired to a flag; a Lever opens or closes it (match flag names).
Water ~ — shallow water, passable.
Deep water — deep water, impassable.
Clr obj — clears whatever is on the cell's floor.