As @AntonyB says, we don't know how you've set up the song length and tempo... and I agree with "Even with that, depending on your lyric sheet layout..."
But I also struggle with this. We don't use backtracks. I tried scrolling manually with pedals and on screen, but no hit. It lead me to trying to use timecodes for scrolling, that get the lyrics in sync but then it jumps at timecodes that make it hard to follow.
Therefor i posted this feature request, Linear timecode-based scrolling
https://support.stagetraxx.com/d/3918-linear-timecode-based-scrolling
Please read and upvote if you like it.
I think it would solve a couple of things related to this issue.