I guess because I've seen this spectacle, on other apps thru the years.
When you're highlighting (old days, a mouse, now a touchpad), not being careful (historically), the highlighting can go either back or forward pages and pages. Whoosh!
But, Logos, at least on the Mac version (latest, aka Verbum), can highlight a 'book' going backwards. But can't go forward; not even a 'page' (scrolling, not paging).
Not important for me ... mainly accidental. I do remember the years and years on the mobile, of people wanting to highlight across pages. Interesting the Mac Logos desktop can't going forward ... at least on mine.