Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 453)

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C.Fn-9 DISP button function
You can assign a frequently used function to the < U > button. When
the camera is ready to shoot, pressing the < U > button will display the
respective function setting screen.
0: Screen On/Off
You can turn on or off the LCD monitor.
1: Depth-of-field preview
The lens will stop down to the set aperture, and you can see the range
of acceptable focus (depth of field) in the viewfinder or in the Live View
image.
2: Wi-Fi/Bluetooth connection
The setting screen for Wi-Fi/Bluetooth connections will appear. The
[Wi-Fi on] screen is displayed when connected via Wi-Fi.
3: Max. screen brightness (temp)
Temporarily increases screen brightness.
4: Pause Movie Servo AF
You can pause Movie Servo AF.
C.Fn-10 Screen display when power ON
0: Display on
When you turn on the power, the Quick Control screen will appear
( = 57).
1: Previous display status
When you turn on the power, the camera will start with the LCD
monitor display in the state it was in when the power was last turned
off. Therefore, if you turn off the camera when the LCD monitor is off,
nothing will be displayed when you turn on the camera again. This
helps to save battery power. The menu operations and image playback
will be available as usual.