The orientation of a type layer determines the direction of type lines in relation to the document window (for point type) or the bounding box (for paragraph type). When a type layer is vertical, the type flows up and down; when a type layer is horizontal, the type flows from left to right. Don’t confuse the orientation of a type layer with the direction of characters in a type line.
Select a type tool, and click the Text
Orientation button in
the options bar.
Choose Layer > Type > Horizontal, or choose Layer > Type > Vertical.
Choose Change Text Orientation from the Character palette menu.