It is not possible to enable desktop notifications using Opera Browser. Flipping the switch does not prompt the user to allow notifications for the site and manually adding rule does not work either.
Yes you are right, notifications are not yet supported for Opera. I will try to add this support as soon as possible.
I’m looking forward to seeing that support added in the future.
It is possible to enable desktop notification by the help of Opera Support that give me the accurate way to reach to the right setting which is very useful.