Designers are usually split on their preference for working with hidden characters shown or, well, hidden. Some prefer the clean preview of working without the interference of hidden characters. Others rely on displaying hidden characters because it helps them see the invisible attributes that can wreak havoc on a design piece. Whatever your preference, it’s helpful to preview your layout with hidden characters revealed, at least once, while proofing. This way, before you hand off your designs to your clients, you can scan your layout for extra spaces between characters, double page returns (or single ones that are larger than others), and extra white spaces. To turn the Hidden Characters on, choose Type > Show Hidden Characters, or press [command][option][I] ([Ctrl][Alt][I] in Windows). Do the same to turn them off again.