Canon EOS 77D - Disabling the Beeper

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You can prevent the beeper from sounding when focus is achieved,
during self-timer shooting, and during touch operations.
Under the [53] tab, select [Beep], then
press <0>. Select [Disable], then
press <0>.
To silence the beeper only for touch
operations, select [Touch n].
This setting prevents shooting if there is no card in the camera.
Under the [z1] tab, select [Release
shutter without card], then press
<0>. Select [Disable], then press
<0>.
If there is no card inserted in the camera
and you press the shutter button, “Card”
will be displayed in the viewfinder and on
the LCD panel, and you cannot release
the shutter.
Handy Features
3 Disabling the Beeper
3 Card Reminder