Not surprised. You likely have a single screen. You can certainly add Epic Name to this screen. The only downside is that you will have Epic Name shown on the create for all issue types which is fine but if you want you can create a uniques screen and screen scheme.
Are you using Classic or New view? If New View, screen layout is not defined through Screens but through Issue Layout:
If it is Classic, to check what screen the Epic uses in a project:
^ This might help you locate the right screen; if not the information above might.
If neither of these help, could you see Epic Name before? Does it impact all projects or just one? Do projects use different screens at all? And does this impact all users?
A screenshot might also help us to decipher what kind of view you're seeing :)
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