There are 3 options to zoom in and out within the magazine.
Option 1:
Double-click with your mouse on the area you want to be zoomed in.
You can then get back to the normal view by double-clicking again.
Option 2:
You're able to move the slide bar to right and left at the bottom right corner of the player.
Option 3:
You can use the "+" icon for zooming in and the "-" icon for zooming out.
