If this is your display?https://www.acurite.com/color-display-lightning-weather-station-06046m.html manual says holding it for 5 seconds disables the light.
"Display Backlight Settings This weather station’s color display features three different lighting settings: High (100%) brightness, Medium (60%) brightness and Low (15%) brightness. Using battery power alone, the backlight is available momentarily for 10 seconds by pressing the “LIGHT” button. When the display is powered with the power adapter, the backlight remains on at 100% brightness. Press the “LIGHT” button once to dim to 60% brightness; press again to dim to 15%, press a 3rd time to enter “AUTO DIM” mode. “LIGHT” will appear next to the clock.
NOTE: Pressing and holding the “LIGHT” button for 5 seconds will disable the backlight. Once any button is pressed, the backlight will return to your selected setting."
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