Canon EOS 80D - Manual (Page 54)

Basic Operation
54
With [54: Multi function lock] set and the switch set
upward, the camera prevents you from changing settings inadvertently
by moving the Main Dial, Quick Control Dial, and Multi-controller or by
touching the touch panel.
switch set downward: Lock
released
switch set upward: Lock
engaged
1
Select [Multi function lock].
 Under the [54] tab, select [Multi
function lock], then press <0>.
2
Add a checkmark [X] to the
camera control to be locked.
 Select a camera control and press
<0> to add a checkmark [X].
 Select [OK].
 The selected camera controls will be
locked when the multi function lock
switch is in the locked position.
R Multi Function Lock
 If the switch is set upward and you try to use one of the locked
camera controls (except when [hTouch control] is set), <L> will be
displayed in the viewfinder and on the LCD panel. On the shooting
function settings display (p.55), [LOCK] will be displayed. During Live
View shooting, [LOCK] will be displayed on the LCD monitor.
 By default, when locked, the <5> dial will be locked.
 In Basic Zone modes, only [hTouch control] is settable.