@jpwong I tried on my iPad, Amanda the 1 2 switch only seems to affect manga, not novels, unfortunately. It also only shows up for novels if you choose pagination rather than infinite scrolling.
This is a feature I’d really love for tablets. I like how the Kindle app has done it as it’s much better line lengths for larger screens. At this point with the current app, I read novels on my phone and manga on the iPad due to having either too long a line length or too big a font on the iPad.