Having just recovered from having broken versions of Opera, I can, now, whinge about trivial issues.
I use the deb file installed version of Opera Developer and the snap version of Opera Stable (don't ask!) which runs in its own snap virtual environment and does not use the Opera files in ~/.config..
In neither version does the navigation icon for the start page appear in the navigation bar and there is no Settings item to add it.
I suppose it is getting on for about a year that Opera One was released and throughout that time the help page has listed its existance.
Is there a way of adding it to the navigation bar?
Don't make me go back to Opera 12!