This project was done a long time ago, so we cannot remember for sure if the window is operable. However, it is very unlikely that we would have specified a fixed window for this setting / usage. We can only imagine that it is operable. I can't see any handles to use to open windows, but it may be due to them being hidden from view by staging items.?

It looks like possibly the smaller side sections are casement windows. I can maybe see a small folded crank on the bottom of the right skinny section.

Yes, I can see that as well. However, it may be just the photographer's lighting bouncing off of the casement. Not sure if there is a crank.