How to reconnect an iPod Classic to the main iTunes library?
I recently had a hard drive failure on my Mac and had to restore my iTunes library from iCloud. Now that I connected my trusty old 5th Gen iPod Classic to my Mac, I got a dialog saying something like "the iPod can't be connected to several libraries" and "do you want to copy your music to the Mac". I then (too hastily) clicked OK. iTunes then did some copying from iPod to Mac. After that the iTunes library I see in the iPod sync view is different than my main iTunes library. I did reset the iPod in iTunes, but I'm still seeing only a part of my iTunes library in the iPod sync window. What do I need to do in order to reconnect the iPod to the main iTunes library so that I can sync music from my main iTunes library to it? My Mac is a Mac Pro (Mid 2010) running macOS Sierra 10.12.6, iTunes version 12.6.2.20.
Screenshot: iTunes library as seen in the iPod view
Screenshot: main iTunes library view
iPod (5th generation), iPod software version 1.3