LibreOffice supports OpenType font format. The two main benefits of the OpenType format are its cross-platform compatibility, and its ability to support widely expanded character sets and layout features, which provide richer linguistic support and advanced typographic control.
The features displayed in the Font Features dialog depends on the selected font.
The font features box contains the configurable features available for the font.
The feature visualization window displays a default text where the selected features can be inspected.