Inspector

Mode

Tiles

Tile 1 [ and ] cycle

Walls

Autotiling: the Wall brush (W) picks each tile from its neighbours. Click a piece below to arm it, then click a palette tile to assign it. A selection can be converted via right-click → Fill with wall.

Specials

Tile art

Replace: any image, scaled to 16×16 and quantized to the tileset palette. Export tile: the selected tile as a 16×16 PNG (pure black saved transparent). Export tileset: the whole sheet as a .bm2 (with its render-mode directive) — re-importable via “Import tileset”.
 
Nothing selected
No region. Pick Region (R) and drag any rectangle over the map — empty areas too.
Middle-drag / space+drag pans · wheel zooms · right-click for selection actions
Align
Center Distribute