One thing which might help with "scannability" is to have a toggle in the LaTeX code which changes it from focusing on displaying the document as a typeset whol

One thing which might help with "scannability" is to have a toggle in the LaTeX code which changes it from focusing on displaying the document as a typeset whole to showing only the typeset code. A possible way to do this would be change the width of the page so that the text lines are so wide each paragraph would only be a single line, then you could set the PDF view to only be the width of the widest code line at the left edge.