Don't use Authy, I agree with you that the Bitwarden UI is getting uglier, but at least they are trying to make it better (it will get worse before they learn lessons to improve), unlike Authy.
And you need to change that preference on every single device, it will not change your default. And they hide this option in a weird place away from all of the other Appearance options.
I'm not one to complain about UI changes but some of their recent decisions are baffling beyond belief.