Canon EOS 70DN Basic Instruction Manual page 234

Feature Guide and Help
Help
When [zHelp] is displayed at the bottom of the menu screen,
pressing the <B> button displays the function's description (Help). If
the Help fills more than one screen, a scroll bar will appear on the right
edge. You can turn the <5> dial or press the <V> key to scroll.
Example: [z4: Long exp. noise reduction]
Example: [8C.Fn I-1: Exposure level increments]
Example: [8C.Fn II-1: Tracking sensitivity]
70
B
B
B
Scroll bar