How to see all unassigned devices on mySky with wifi max?

[IGGt]

I've just upraded to sky wifi max, and for the most part it seems to work ok (at least as well as the old router, just). 

I am looking at the MySKY app to split our devices out into groups (mainly so I don't accidentally pause mine or my wife's work devices), but there doesn't appear to be an easy way to identify which ones are "unassigned" to a group. Am I missing something obvious, as this seems to be quite a key requirement in order to assign devices to a different group.