#Changing the display value for null globally in admin
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That's determined by the NullBooleanSelect widget, I'm not sure how you'd be able to change it globally: https://github.com/django/django/blob/main/django/forms/widgets.py#L866
I think you'd need to subclass that widget, set the choices manually in init, and override each field in the forms used by the admins
I imagine you could monkey patch the model field's class so that is uses the widget you want in formfield