"samsung security policy update" doesn't appear - but I want to disable it

Hi,
I have a Galaxy S6 5.1.1 bought in Thailand. It is rooted.
I want to use AdBlock Plus but it doesn't block the ads.
I read in ABP's forum that in order to make it work I should disable "samsung security policy update".
However, this option doesn't appear where it should, and I see no option to do so.

Could anyone help??

"Security policy updates" still appears after freezing

I am still getting these even after freezing everything I can see related to Knox. Ideas?