@SteenTP 

Nope, you are right. It's gone. I don't know when they removed it and whether it was intentional or not but there is no longer an option to use 6ghz as backhaul only. Also, I am not sure if this is an issue with the app or a more recent firmware update to the XE75.

  @cadz 

Thanks, it was not just me getting old then 

I hope that it defaults to dedicating 6GHz to to backhaul when it is turned off for 'regular' use.

It would be nice to have an official confirmation and an explanation of why it was removed.

  @SteenTP Indeed, it was never possible to control the usage of 6GHz by the backhaul: the backhaul always tries using all bands.

I believe the new approach is easier to understand, and is similar to the way the other bands are configured.  There is no reason to mention "backhaul", as the context is to control the bands offered to the clients.

An, indeed, the transition from the old to the new approach is confusing.