How to turn off dangerous ssl/tls settings?

[Desiree]

I am very unhappy that Vivaldi allows ssl 2 and 3 and tls 1.0.

I allow nothing below tls 1.2 on my default browser. I looked in Vivaldi flags (where some time ago I turned on tls 1.3) but couldn't find any setting for ssl 2 or 3 or tls 1 or 1.1 so I can turn them off. My other browsers do not allow me to go to a site that Qualys gives an F to the server (horrifically bad security) but Vivaldi happily takes me to that very (security wise) dangerous site.

So, how do I make Vivaldi a reasonably secure browser? I want ONLY tls 1.2 allowed (or tls 1.3 which I allow as experimental). If a site is so badly managed that it does not use tls 1.2 then I have zero interest in going to it.