If you’re familiar with the older window, and would prefer using it, you can still do so.Just select one or more files, press the Option key, right-click on the selected file(s), and choose Get Info.i Tunes has a useful little window called the Mini Player.
If it was hidden, because you switched to the Mini Player, closing the small window brings back the full window, which wasn’t the case previously. While in your Music library, click Playlists in the navigation bar; you’ll see an entry for Music Videos near the top of the sidebar.
It also displays how much time remains to be played in the current track, shows artwork, and you can even use it to search your i Tunes library.
Some people may find it sufficient to control music playback, and not even need the full i Tunes window.
The first thing that many people noticed in i Tunes 12 was the absence of the long-familiar sidebar.
This sidebar, present since the early days of i Tunes, grouped all your media libraries (Music, Movies, TV Shows, etc.) and your playlists in one convenient location, giving you quick access to any of the content in your i Tunes library.