Adobe Indesign Cc 2017 12.1.0.56 ((exclusive)) Page

: Designers gained the ability to see on-canvas OpenType properties. By simply selecting text, users could access a menu to apply ligatures, fractions, and alternates instantly, significantly speeding up typographic workflows. Footnote Improvements

Version is legendary in prepress circles because it fixed three catastrophic bugs from the initial CC 2017 (12.0) release: Adobe InDesign CC 2017 12.1.0.56