4. How to show an uneditable field in admin?

If you have a field with editable=False in your model, that field, by default, is hidden in the change page. This also happens with any field marked as auto_now or auto_now_add, because that sets the editable=False on these fields.

If you want these fields to show up on the change page, you can add them to readonly_fields.:

@admin.register(Villain)
class VillainAdmin(admin.ModelAdmin, ExportCsvMixin):
    ...
    readonly_fields = ["added_on"]

With this change the Villain admin looks like this: