Canon EOS 70DN Basic Instruction Manual page 536

3 Custom Function SettingsN
C.Fn II -7
You can limit the selectable AF area selection modes to suit your shooting
preferences. Select the mode you want to use, then press <0> to append a
checkmark <X> and select [OK].
: Manual selection: 1 pt AF
You can select one AF point.
: Manual select.: Zone AF
The 19 AF points are divided into five zones for focusing.
: Auto selection: 19 pt AF
All of the AF points are used for focusing.
The <X> mark cannot be deleted from [Manual selection:1 pt AF].
C.Fn II -8
You can set the method for changing he AF area selection mode.
0: S 9 AF area selection button
After you press the <S> or <B> button, each time you press the <B>
button, the AF area selection mode changes.
1: S 9 Main Dial
After you press the <S> or <B> button, turning the <6> dial changes
the AF area selection mode.
When [1:S 9 Main Dial] is set, use <9> to move the AF point
horizontally.
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Select AF area selection mode
AF area selection method