Could you be a bit more specific with your question? There are many size "windows" in outside cabins. The only portholes are on Deck 1 for crew cabins. Passenger cabins begin on Deck 2 with split rectangular shaped windows. Decks 3 and 4 have slightly larger rectangular windows, without the split. They're about 3 feet wide.
Does this answer your question?
Take care, Steve
I'm Steve Cooper. I love Royal Caribbean, and recently discovered NCL and love them too. I've also cruised Princess and HAL.
NCL Pearl Alaska Glacier Bay
RCI Liberty of the Seas E. Caribbean