Viewing the playlist is an organization tool that helps you to work on certain sections of your song. Generally, the more pieces and parts you have, the more often you will be resizing your playlist.
To start viewing the playlist and to change the vertical and horizontal zoom parameters, you simply need to have the playlist open with patterns inserted inside it. An easy way to bring up the playlist is to press the F5 key.
Let's look at how to zoom in and out of the playlist while looking from left to right: