The Compass lets you browse through the complete font library by simply moving your cursor across the screen. Depending on where the cursor is in relation to the two axes, the Compass will suggest a new font.
Once you have found a font to your liking, you can open the detail view by left-clicking on the screen.
A right-click will save the current font to your list of favourites.
Fonts you have saved in your favourites list are displayed as red dots in their corresponding locations. You can open and remove fonts from the list directly from the compass view.