Ok I just figured out you can turn the device to portrait orientation and select which page should be on the left. This is an awesome feature but a pretty secretive one!
I’d like to second the request for having this option in the view settings. I’m glad to having the option to adjust it with the portrait mode trick, but it’s somewhat awkward to do and I find that it some time changes what’s on the left without going into portrait mode. The portrait mode fix is also a bit unintuitive when reading right to left, since it means that the page you view in portrait mode becomes the second page in a two page spread, rather than the first.
Thank you so much for all your hard work, I’m really hopeful that I’ll be able to switch to panels for reading my manga collection, the old app I was using made importing pretty clunky, and panels feels much smoother and more modern.