Chicago PD Season 2 & 3 are on the NowTV service where it looks like they are contained in a second folder.
Either type Chicago PD in your playback device search engine where you will see two results or go to Entertainment > then select Channels > then select Sky Witness where you will find two separate folders of Chicago PD.
@Jason-C of the NowTV Team you need insert all the Seasons into one folder or if you are going to have two folders until Season 6 becomes available in early February then leave Season 7 in the second folder.
Seems that NowTV have now updated the Chicago PD folder.
Though it's still no right, where Season 2 is back in the main folder, but Season 3 is still located in a separate second folder under Sky Witness.
At least now you know where to find the two seasons.
At the moment season 3 is located in a second folder under Sky Witness (just in case you can't find S3 when looking in the main Chicago PD folder in the Sky Witness section).
I have brought this to NowTV's attention, but shouldn't effect your boxset binge watching marathon 😆.
According to Sky viewer relations they will be airing all the Chicago shows new seasons in February. No date confirmed yet though.