I recently purchased the TR8520 but am unable to print in draft mode from my Mac (OS 10.14, Mojave). The three printing choices appear - draft, normal, and best - but when I drag the arrow to “draft” and release it, it jumps back to “normal”. I’ve spoken to customer support at Canon and Apple, who pointed fingers at each other. Finally the Apple rep suggested I ask the community. Can anyone help? Thanks!