Yufuin No Mori - seating

Hi there, I read this post < https://www.jrpass.com/blog/yufuin-no-mori-and-the-jr-pass> about the train and I wonder if all the seats can be turned around to make 4 seats facing each other. I will be taking the first train from Hakata to Yufuin with my family. It will be great to know the location of these seats in the train when making online reservation. Besides, can they be easily turned around?

Thanks a lot!