So, I pressed "Never save password" for a couple of sites and I want to change my mind. Is there a way to do that? If so, what is it? If not, I suggest that it be added.
Open the internal URL vivaldi://chrome/settings/passwords
There you may delete the entry for "never Save password" site in the lower list.
But do not open passwords. google. com! Vivaldi passwords are stored locally and you will never get them back at google.