\defaultfontfeatures[MonaspaceXenon-Medium]
{
  Extension=.otf,
  UprightFont=MonaspaceXenon-Medium,
  ItalicFont=MonaspaceXenon-MediumItalic,
  BoldFont=MonaspaceXenon-Bold,
  BoldItalicFont=MonaspaceXenon-BoldItalic
}