Epic link shows up when I create an issue or when I have the abbreviated view from the backlog, but when clicking on the issue and viewing it in the full view, the epic link isn't visible. I noticed that if I assign it an epic (from the non-full view), then I see in the full view, but when no epic is assigned the field is missing.
I believe I set everything up properly in all the places (field configuration, screen, screen scheme, and issue layout) but still no luck. I also don't have any particular controls on any issue operations, everything is default.
I normally can figure things out in Jira, but this one really has me stumped. Thanks!
Here are some screenshots showing what I mean: 
