Canon EOS-1D X Mark III Advanced User's Manual page 230

3.
Take the picture.
To cancel exposure compensation, set the exposure level <
the standard exposure index (<
Caution
If [ : Auto Lighting Optimizer] (
image may still look bright even if decreased exposure compensation is set to
darken images.
Note
Can also be set by pressing the <
dial.
The exposure compensation amount will remain in effect even after you set the
power switch to <
To prevent accidental changes to the exposure compensation amount after setting
it, set the power switch to <
If the exposure compensation amount exceeds ±3 stops, the end of the exposure
level indicator will display < /
) is set to any setting other than [Disable], the
> button and turning the <
>.
>.
> or < /
230
/ >).
>.
/ > to
> or < >