Final cut pro timeline

Here is a screenshot illustrating the situation. The audio is shown in its separate lane, so each clip containing video and audio appears "duplicated"

After clicking "Hide Audio Lanes", video and audio no longer show separately:

Your screnshot does not let us see where exactly things are. It is too much of a closeup, so to speak.

In particular it does not let us know where the primary storyline is.

But after messing around in FCP to try and reproduce your situation, I succeeded 😎

Open the Timeline Index (Command-Shift-2)

Select "Roles"

Click "Hide Audio Lanes".

Done.

Impossible to say without more info. Could you post a screenshot showing what you are seeing?

My best guess is that you have expanded audio. If that is the case then you can control-click on the clip and choose Collapse Audio.