Canon EOS 80D - Multi Function Lock 

Basic Operation
54
With [ 54: Multi function lock ] set and the < R > 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.
<
R > switch set downward: Lock
released
<
R > 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 <R> 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.