How to Disable Preselection List Display from Django Admin

Hi I want to disable the preselection from django admin, here is my code

from django.contrib import admin
from django.db import models

class Person(models.Model):
   name = models.CharField(max_length=50)
   birthday = models.DateField()

def decade_born_in(self):
    return self.birthday.strftime('%Y')[:3] + "0's"
 decade_born_in.short_description = 'Birth decade'

class PersonAdmin(admin.ModelAdmin):
    list_display = ('name', 'decade_born_in')

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