Zones are 2d areas that allow you to quickly map out and measure different Usages across your site in the early stages of your design.
Zones can also be used for specific parts of a project, for example, car parking areas.
To create a Zone, make sure you are on the Zones Tool:
Once you have drawn a "closed" shape, Spaces will automatically create a Zone.
Automatic creating of items is controlled via the Drawing Settings in the bottom right:
A Zone will be created based on the current default settings.
If you have Create items automatically disabled, you can create a Zone by, again, drawing the outline and then using your finger to tap inside the enclosed shape.
If you draw a series of strokes indicating a number of areas, the manual creation process will create a series of individual Zones.
With the Usage Palette open you can also drag a specific Usage Type, and drop it within the enclosed shape. Again, a Zone is created based on the current Default Settings along with setting the Zone Usage based on the Usage Type that you dragged.