Unique
When the mode is set to Unique in the Colour Set Wizard: Colour entries are generated for each unique attribute value or unique combination of attribute values (when more than one attribute is selected).
Options
Options will vary depending on the mode selected and the (Numeric or Text) type of the attribute(s) you have selected.
Attributes
Use the drop-down to select one or more attributes. To browse attributes and their properties click the ellipsis.
Loaded Layers
Use the drop-down to select from the layers loaded in the Design Window.
Accept
Click Accept to apply the settings you have made (or click Cancel to discard your changes).