Change any dimension and the section, plan and every derived check redraw. The acoustic and fit checks are the ones worth watching — they are what the drawing cannot tell you at a glance.
SVG is vector. PNG and PDF are 4000 × 2828, about 240 dpi at A3. On claude.ai every save asks you to confirm, and SVG or PDF may not be permitted there — PNG always is. Ctrl+P prints the sheet on its own at A3 landscape.