First, toggle on or off the Family Library setting according to your preference. You’ll also find some apps where the toggle isn’t there. Paid apps will be immediately included. It was up to developers to enable the feature for apps purchased before July 2016; while it was not mandatory. Also it encouraged developers to give a better customer experience. I’ve also found that some apps I bought were eligible for the family plan. But the toggle for including them with the group wasn’t on by default. It was a nuisance that you had to put up with a few instances. If there’s an app you expect to be in your library and available from the Play Store, then go to My apps & games and click Family Library. Then you can individually add an app to your batch by flipping the toggle.
