how did you turn it off? if i may ask
So far I have only turned forwarding off in the turris web UI.
I find it a bit disconcerting, that the set-up makes it so hard to change the DNS server.
Using forwarding is a useful feature, not beeing able to influence it is bad.
I added the configuration to the normal openwrt places and went off, only now to discover, that my router has used the ISPs DNS servers all along. 
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