Playback question

I came across an issue today which I had never noticed before, (normally only really use party mode)

I had added a 4 cd set to the library

when tagging the the album with MP3tag I used 1/4, 2/4, 3/4 and 4/4 respectivly for each cd in the discnumber field

I wanted to play disc 4 only but I couldn’t find any obvious way of doing this, as when I select the album thourgh the interface it shows me all the tracks for all 4 cds in the collection but at least sorted into the correct order.

so ended up resorting to queuing each of the tracks on the 4th cd of set individually.

Am I mising something really obvious or should I be tagging multi disc sets in a different way ?

I am using confluence skin and kodi 17.1

Thanks for any hints