In Jira Cloud:
A client showed me that they cannot see the child issues of an initiative in JS. I can see them just fine, but they showed me their screen and it's true, they cannot see them. What needs to be turned on for a user to see the child issues of an issue? In this case there is an initiative with 4 child epics.
I found this but it references portfolios which looks like it is only in use in Jira server