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As feedback I would say this is an interesting one.
Yes since Trusted Files are mostly part of D+, you might expect them to be disabled if D+ is disabled.
But, Trusted File status also confers some firewall privs and may affect the operation of the AV too.
So maybe in practice it is right that the operation of the trusted file list does not depend on that switch.
BTW the best way to ensure trusted files are ignored is to switch to paranoid mode in D+, but get ready for lots of alerts
If you just want to stop CIS adding (non-OS) entries. Disable cloud lookups. Untick ‘automatically scan unrecognsed files in the cloud’ and perhaps ‘Perform cloud-based behaviour analysis’ in Defense Plus settings ~ Execution control settings. Also in AV settings, scheduled and manual tabs, you may need to disable cloud scanning. Now delete all the entries except Microsoft entries in the Trusted Vendor List
Tested what mouse said and it worked (took me 7 minutes to delete all the Trusted Soft Vendors :D), no more Trusted Files appear but I started to be spammed with alerts of every program that I use and didnt have in the “Firewall - Application Rules” :-[, so I decided to turn back all the changes and just leave Defense+ perma-disabled but nothing else.
Really my topic is a bit “OCD” but its annoying to see hundreds of process added in the Trusted Files, because I test a lot of software and in 1 week my list has 100 entries and I must do a “Purge” regularly to clean all the nonexistent files, but well, I will keep doing it because I saw that there is no choice.