The currently selected Stroke color, or color of any line segment you create, is displayed in the Stroke Color box. By default, the Stroke Color is black.

The currently selected Fill color is displayed in the Fill color box.  By default, the Fill color is white.  {Click} the Default Colors icon to restore or return the Stroke and Fill colors to default black and white. To switch the Stroke and Fill colors {Click} the Switch Arrow.

Stroke Color  

Fill Color  

Default Colors and Switch Icon