Unfortunately the slider does not fix Liquid Glass. Notifications are still unreadable even when you go full opaque. You need to also toggle Reduce Transparency to actually get the UI to be opaque enough to be readable.

Jeez, it's an accessibility feature and they just turned it off!

I don't mind liquid glass and can handle the transparency mostly, but the notifications are just god-awful and difficult to read (white on light glass, using dark mode, who comes up with this stuff?).

But reducing transparency is a much harder setting now (should be "removing transparency"), I don't like it anymore, it also messes with the wallpaper. The previous setting was just right for me. Now the app squares are just black, very bad with dark icons.