Below file miss configures unbound to function as a simple regular DNS proxy/forwarder/stub resolver instead of a full blown recursive DNS resolver:
/etc/unbound/unbound.conf.d/resolvconf_resolvers.conf
Ditch that file with below:
sudo rm /etc/unbound/unbound.conf.d/resolvconf_resolvers.conf
And and make above change reboot persistent by hashing out below line (put a hash sign # in front of it):
pi@ph5b:~ $ sudo nano /etc/resolvconf.conf
[..]
#unbound_conf=/etc/unbound/unbound.conf.d/resolvconf_resolvers.conf
And run below to apply:
sudo systemctl restart unbound.service
And check status:
sudo systemctl status unbound.service