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Nah, it's totally different on the GBX-100 module, it has an actual menu system.
https://support.casio.com/storage/en/manual/pdf/EN/009/qw3482.pdf
Page 6 in there.
Regal
MementoMori
I've got a GA 2000, not sure if this applies to all models but here goes:
To change the illumination duration
In the Timekeeping Mode, hold down A until the flashing SET indicator disappears from the display and the currently selected city code appears on the display.
Press C ten times to display the illumination duration setting screen.
Press D or B to toggle the illumination duration between three seconds(3 displayed) and 1.5 seconds (1 displayed).
Press A to exit the setting mode.