Canon EOS REBEL T3 Basic Instruction Manual page 307

C.Fn-10 LCD display when power ON
0: Display on
When the power switch is turned on, the shooting settings will be
displayed (p.46).
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 press 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.
3 Custom Function SettingsN
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