Net3 DMX Gateway backlight on selection grayed out

I'm using GCE to configure my Net3 DMX Gateway.  I want to change the settings so that the backlight for the LCD screen is always on.  I can see the selection for doing this in the DMX Gateway Configuration menu under the Identity tab.  However, all of the selections for changing the backlight's behavior are grayed out.  Could someone advise me what I am missing?

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