When I read from the Catechism in Logos, scrolling up or down with the arrow keys goes e-page by e-page and I see arrows in the bottom right hand corner of the panel that let me click for the same effect. When I read other resources, such as the Documents of Vatican II or whatnot, I find no such arrows and no such scrolling functionality. I cannot find a setting to change in order to enable/disable this feature.
So what am I missing?