Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 523)

523
Headphone Volume
1 Select [ 5 : Headphone volume].
2 Make the adjustment.

Use the <
Y
> <
Z
> keys to adjust it,
then press <
0
>.
o You can check sound from the built-in microphone or an external microphone
on headphones when [
z
: Sound recording] is set to an option other than
[Disable] .