help_properties

The defaults used can be changed by the panel that opens when you click "Properties" under "File" in the menu.

Default Mouse Mode: This specifies which mode (read this for info) is selected when you open a new session of PaintBox.
Default Border Color: This specifies the color that is the border color that will be selected when you open a new session of PaintBox.
Default Background Color: This specifies the color that is used as the background color when you create a new drawing.
Filled By Default: If this check box is selected when you start drawing a new shape it will be filled with the color specified by Default Fill Color.
Use Border Color For Fill: If this is checked, then shapes being drawn will be filled with whatever color its border color is.
RGB Range: This specifies the range of numbers used to specify a color.
Copies go: This specifies what layer a copy of a shape goes to:
 to front: This means that the copy of a shape will go to the highest layer (on top of all other shapes).
 to back: This means that the copy of a shape will go to the lowest layer (below of all other shapes).
 in front of original: This means that the copy of a shape will go on top of the shape that was being copied.
 behind original: This means that the copy of a shape will go behind of the shape that was being copied.
Customize Add Menu: This allows you to add new shapes to the add menu.
Save: This saves all the changes to the defaults you have made.
Restore Factory Settings: This will return all of the defaults to the state they had when you downloaded the program.