Sync Radio Display

How do i control the brightness of the sync display, or turn it off.

Once i have selected a station, playlist or even silence, i would like to turn off the sync display.

I have not discovered how to do this or even a hint that this is possible.

At night, i turn down the brightness on the dash lights, but the sync is just as bright as daytime, i'm left stuffing a hat over the display just to prevent it from impacting my night vision.

I'm hoping the collective wisdom of this forum can point out this missing bit of info.

Thanks