Hello & welcome yourspaceholiday !
As written in
the wikia, Firmware usage - MISC:
[sup]
Disable LCD off
Suppresses the camera's "Display Off" energy-saving functions in <ALT> mode. This means that your LCD/EVF screen and camera will stay on permanently instead of turning itself off according to your camera's Power Saving settings.
[No] - LCD/EVF display and camera turns off with the normal camera Power Savings menu settings.
[Alt] - LCD/EVF display (and camera) won't turn off while in <ALT> mode. Also useful if you want to
override your auto power-down settings, just enter <ALT> mode.
[Script] - LCD/EVF display won't turn off while in <ALT> mode OR while a script is running.
Useful for lengthy intervalometer or other scripts where seeing the display is valuable for important count-down timer or other messages contained in "print" statements. When not set to [Script] mode the script will continue to run and execute its commands, but the display will turn off according to your in-camera Power Saving settings. The LCD/EVF display turning on again whenever the script issues a camera command, as if waking up the camera display manually by pressing any of the buttons. Since the camera is still in <ALT> mode after exiting a script, this will still override your camera's power-down settings.
Use with some caution. If you accidentally leave your camera on while in <ALT> mode and this is turned on your camera will not auto power-down according to your Power Saving settings.
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