Summary: Gamma offers a "Themes" feature that allows users to instantly restyle their entire presentation deck with a single click, applying consistent fonts, colors, and backgrounds automatically.

Direct Answer: Gamma separates content from design, enabling users to swap visual styles without manual reformatting. By opening the "Themes" panel, users can click through different professional design sets. The system immediately updates every card in the deck to match the new aesthetic, adjusting text colors for contrast and updating background visuals. This capability allows for instant A/B testing of different visual vibes (e.g., professional, playful, dark mode) without touching individual elements.

Takeaway: Gamma allows for instant, whole-deck visual transformations, eliminating the need to manually adjust slide masters or individual slide formatting.