Apple changed a lot of things in iTunes 12, interface being one of them. There's a slightly major revamp to the UI of iTunes, making it flatter and minimalistic, in keeping with the overall theme of OS X Yosemite.
A consequence of this is an apparent change in the way the playlists look where you get to see slightly larger fonts instead of the old, smaller ones. This results is a well-spaced-out view but if you’re used to seeing a lot of songs without scrolling, this might no longer be possible. Fortunately, you can change the font-size in iTunes 12 (font-size of the playlist window/view). Here's how.
Changing the Font-size of Playlist Items in iTunes 12 On a Mac:
- Open iTunes
- Click on iTunes from the menu (on top)
- Click on Preferences
- Click on the General tab.
- You should see a label called List Size. There's a drop-down menu next to it. Select Small from the drop-down.
On the contrary, if you want larger font sizes for the playlist, select Large.
Changing the Font-size in iTunes 12 Library On Windows:
- Open iTunes.
- Hold Alt to reveal the menu options. Then click on Edit. (you can also press Alt+E.)
- Click on Preferences.
- Now, from the drop-down next to List Size, select Small.
On Windows, there's an additional option. You can reduce the font-size in the sidebar (Playlist) too. To do this, select Small from the drop-down next to Playlist Icon Size.
I am not exactly sure why the Playlist Icon Size option is not available for Mac.
It's not probably the case where you want to reduce the font-size. May be the resolution is too high on your Retina Mac and you want to increase the size. In this case, you'll select “Large.” Once you do this, you should notice that the playlist now lists less number of songs but the font-size is larger.
You’ll probably notice this too. When you change the font-size, not only is the font-size affected, but the padding around the list items is changed too.