As with any other Headcycle click on photos to make them full screen.
Once a photo is fullscreen you can pan vertically or horizontally with your mouse or by tapping your screen.
Here's a good example of an ultrawide image in /h/f8andbethere.
Roxborough Park, CO, Sculpture in motion.
Love the background on how you've allowed so much of the trees to show. Keep up the good work, mate.
This is a great shot.
You might want to crop it a bit on the right, but other than that it's perfect.