You haven't tried the syntax shown in the example:
dconf reset -f /org/gnome/evolution/
This syntax does work, I used it as in
dconf reset -f /org/gnome/terminal/
I'm not sure why you're doing this with sudo. Aren't you
resetting
your own user-account's dconf parameters?
Ye, that is the case: the
~/.config/dconf/user file gets modified.
One can back this file up and later simply restore it if, e.g.,
modifications are not good/desirable.
Also one can do the configuration backup as in
dconf dump / >root.dconf.dump.f35.orig
and later restore it as in
dconf load / < root.dconf.dump.f35.orig
greg