I have often seen speed readers share a trick, which suggests drawing an imaginary grid or a real grind lines on pages, and keeping focus on that area by reading the whole line rapidly by peripheral vision. Just two lines after 2-3 words of each margins of the page. Shown here, the trick is very popular.
https://youtu.be/0Q0we4LjSws?t=527
So, a feature should provide that grids which is customizable, in the layout option. I get this suggestion request to the right people.
thanks.