Public proposal links automatically scale to fit any device. On a phone (~375px wide) the deck shrinks so each A4-sized page fits one screen — no horizontal scrolling. On tablets and narrow laptop windows the scaling adjusts in real time as the viewport changes (orientation, browser resize).
The print PDF — the version your guest gets when they click Print — always renders at full A4 size regardless of viewport. This is intentional so the printed document looks correct on paper.
If a guest reports a layout that doesn't render right on their device, ask which device (model + browser) and what they see. Most issues trace to a custom font that doesn't load on iOS Safari; in those cases falling back to system fonts in /settings/brand fixes it.