django admin select all checkbox not present

Please read this question! The "select all" header checkbox that I used in Django 1.5 is missing in Django 1.9

I have same problem with django version 3.2.14. I am new to django and not understanding what is overriding in my files that even I can't see this select all checkbox. Also, I did run "python ./manage.py collectstatic" this. it still didn't change anything on my portal.

Thanks in advance!