Epix Gen 2 displaying a data field from Connect IQ

From Connect IQ I have installed to my Epix Gen 2 a data field showing my blood glucose (from a Freestyle Libre sensor).

I have added a data screen in the Walk activity which shows the field when I am in that activity but I cannot work out how to show the field when I’m not in an activity. ie. Just wearing the watch.

I had expected to be able to add a `glance` with the new field or even add it to the watch face but for the life of me I can't work out what to do!  Maybe I’m missing something obvious.  Any suggestions would be gratefully received.

I guess it’s the same principle for any data filed from Connect IQ.