360 Plus Any way to hack page layout?

After a failure of part of my screen on my PB360+, the bottom part (about two rows) are not visible any more. I was looking for a way to limit the text of my ebooks to margins, beyond those provided by the original software. as to allow me to read as if i had a smaller screen.

This ofcourse is just a "bandaid" until I can aford a new reader.

any advice is welcome