Your essay should be typed, double-spaced on standard-sized paper (8.5" x 11") with 1" margins on all sides. You should use a clear font that is highly readable. APA recommends using 12 pt. Times New Roman font.
Where most presentations fail is that their authors, convinced they are producing some kind of stand-alone document, put everything they want to say onto their slides, in great big chunky blocks of text.