Here is the complete changelog of Windows 10 Build 21376 Updated Segoe UI font We are introducing Segoe UI Variable which includes an optical axis so that font outlines can scale seamlessly from small to larger display sizes. Segoe UI Variable is a refreshed take on the classic Segoe, now with improved legibility at small sizes, and much improved outlines at display sizes. 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.