Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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By setting the <R> switch to the right, you can prevent the settings 
from being inadvertently changed by such as the following: Accidentally 
operating Main Dial, Quick Control Dial or Multi-controller, pressing the 
AF area selection button or tapping on the touch screen.
For details on the Multi function lock switch, see page 62.
1
Select [Multi function lock].
 
Under the [55] 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].
X
When the <R> switch is set to 
the right, the checkmarked [X] 
camera controls will be locked.
R
 Setting Multi Function Lock
 
If the <R> switch is set to the right 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 Quick 
Control screen (p.64), [LOCK] will be displayed. During Live View or 
movie shooting, [LOCK] will be displayed on the shooting screen.
 
By default, the <5> dial will be locked when locked.
 
In the <A> mode, only [hTouch control] can be set.
 
Quick Control (p.64) will work regardless of the Multi function lock 
setting.