Spread pushes landmasses toward the canvas corners (1.0 = full bleed). Size variance lets some continents dwarf others. Both mostly affect World mode.

"New Terrain" rolls everything inside the archetype's envelope. "Re-roll Layout" keeps your sliders but rolls a new seed. Move any slider to fine-tune.

SVG is full vector. PNG renders at 2400 × 2400 from the unzoomed full canvas.