Create a Polygon

This Feature is added from the Preview pane toolbar.

To accurately place a Feature on the earth, make sure the earth is viewed from above (tilt = 0).

Move the earth to the desired location, zoom and window size
Click the button to start a new Polygon
Each time you click on the earth, a new polygon node is added at the clicked location
To end adding polygon nodes, click the Polygon button or double right-click anywhere on the earth or press F6

While creating a Polygon, the Style Defaults of Polygon will be used.

The newly added Polygon Style will either:

take the Shared Style if the container where the Polygon is added has a Style Url defined. No in-line style will be created and the Polygon will have its Style Url match its container's Style Url.
use the default Polygon Style defined in Tools » Options » Styles Defaults. The Polygon will have an in-line style automatically created.

You can change the Style of a Feature from the Style tab (in-line) or from the Shared Style button ( ) on the Tree pane toolbar.

Editing an Existing Polygon

In order to edit an existing Polygon, the Edit button ( ) must be 'on' and you must select the Polygon Feature from the Tree pane.

To move node, drag it.
To add a node, drag a semi-transparent node.
To remove a node, double-click it.