Many democratic countries have courts without juries. E.g. in France (and in many other countries in Continental Europe, because Napoleon) only the Cour d'assis

Many democratic countries have courts without juries. E.g. in France (and in many other countries in Continental Europe, because Napoleon) only the Cour d'assises, which has jurisdiction on serious crimes, has lay judges (not exactly the same as jurors, but close enough). All the other courts, including all the appellate courts, have professional judges only.