I know how to do it in FCP. But I have a juicedlink so I only need the Left channel for all my clips.
I just shot a short film and there are 48GB of footage, that's a lot of clips to go to one by one and deselect audio channels.
I can't select all the clips, go to import settings, and deselect the right channel for all the clips at once.
I have to go to Clip 1, import settings, deselect left channel, then import, go to Clip 2, import settings, etc.
wish there was a way to set import prefs so I feel your pain. In the end you have to do what you have to do, all part of the editing gig. Either left them as 2 channel and then just unpatch the unwanted track in FCP or use the setting for each clip.