Microsoft releases Windows 10 Build 21376 with a new font for better scaling Build 21376 comes with an updated UI font, and other cosmetic tweaks. The updated font, Segoe UI Variable, includes an optical axis that lets font outlines scale seamlessly from small to larger display sizes. This also means better legibility at small sizes. Advertisement Microsoft explains: Historically, fonts for printing small text were designed differently than fonts designed for large display text. Segoe UI was originally designed to work at 9pt, which makes it a great font for that size, but limits expression at large sizes and lacks legibility at even smaller sizes. Segoe UI Variable solves this by using a new version of Segoe that uses variable font technology to dynamically offer great legibility at very small sizes, and style at large sizes.