Display navigation in the digital instrument cluster

[Britunculus]

I remember checking the tick box in the Navigation settings when I first got my Scala to turn this on. Now it is becoming irritating as I cannot turn it off and the option has disappeared from the settings. I don't need guidance most of the time and switch off the main Infortainment screen but this keeps coming back.

 

Any ideas as to how to restore the on/off check box in settings ( behind the 3 dot icon iin the bottom right corner of the map screen)?

 

The manual shows it but no explanation as to how or why it might disappear.