Canon REBEL T3I EOS 600D User Manual page 257

C.Fn-11
0: Display on
When the power switch is turned on, the shooting settings will be
displayed (p.47).
1: Previous display status
If you pressed the <B> button and turned off the camera while the
LCD monitor was off, the shooting settings will not be displayed when
you turn on the camera again. This helps to save battery power. The
menu screens and image playback will still be displayed when used.
If you pressed the <B> button to display the shooting settings and
then turn off the camera, the shooting settings will be displayed when
you turn on the camera again.
LCD display when power ON
3 Custom Function SettingsN
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