OS Ventura Dock position with multiple displays

If the Dock is positioned at the bottom it typically will appear in any display, provided that you move the cursor to that area. It will only appear in one display at a time, but it will move depending on user action.

FWIW, I think the Dock is best kept out of sight, I could happily live in macOS without it, as there are better ways to do what it does… launching applications, switching to applications, switching to other windows can all be done from the keyboard… (though technically the Dock process is necessary for Command-tab so I do need it, just don’t need to see it or click it).