Cuts this canvas into a grid of named tiles — rows and columns, each with its own size. Pick a tile and the four + buttons around it add a row above or below, or a column left or right.

Shift-click a second tile to pick a block, then Join — a 32×32 tile on a 16×16 grid.

A box you can draw inside but not outside. Create one, set its size, then Lock it. Or use the Region tool (D) to drag it on the canvas. Remove it any time with the ✕ on its top-right corner.

Tap the ✕ on its top-right corner to remove it. Del and View ▸ Remove sub-canvas work too.