Disp function on a Nait 5's remote

I can’t turn off the volume pot’s and input selectors’ lights with the remote on a Nait 5. I can’t remember if that was doable on my previous one, years ago. Is it an issue with the remote or isn’t an available function on the Nait 5?
Thanks for the info.

Have you tried pressing the preamp button before pressing the disp button?

I did. All other functions work. And I put new batteries…

It doesn’t on mine…

IIRC, this was not possible with the original NAIT 5.

@AndyR, @Richard.Dane,

thanks, I’ll stop thinking about it.