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Hi @Anonymous ,
As long as you applied any one of the policies, the setting "Use secure DNS to specify how to lookup the network address for websites" would be grayed out.
If you hover your mouse pointer over the little briefcase icon beside the greyed-out slider, you'll see a message said "This setting is turned off for managed browsers", which explains why the option isn't available.
Therefore, this is an expected behavior.
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Best Regards,
Raina Zhao