More details can be found in this stackoverflow thread. It seems like this
is a requested feature.
https://stackoverflow.com/questions/53821727/django-admin-list-filter-
remove-all-option
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Ticket URL: <https://code.djangoproject.com/ticket/34031>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
* status: new => closed
* resolution: => wontfix
* easy: 1 => 0
Comment:
Thanks for the ticket, however Django Admin is not a
[https://docs.djangoproject.com/en/stable/ref/contrib/admin/#module-
django.contriab.admin universal tool for building an app] and adding a new
hook to the `ModelAdmin` is always controversial (we already have many of
them). Also, there is not much overhead in overwriting
`SimpleListFilter.choices()`.
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Ticket URL: <https://code.djangoproject.com/ticket/34031#comment:1>