Let me introduce you to this amazing thing called Control f.Problems like this are why good old fashioned books made out of paper were invented.
Trying to scroll up and down a PDF or Word file is more inconvenient. There isn't any way to "hold your page while you look at something else."
My preferred method of spell organization remains how 1e did it. I didn’t have to skip past dozens of spells my class couldn’t even cast, and having it broken down by level made it easier for me to find the spells I wanted.
YMMV of course.