The Map Legend section of the Display Options Configuration controls the display of a legend for vector data or raster data with palette colors.
Access the Map Legend options by selecting the 
Configuration button from the File Toolbar or Tools menu, and navigating to the Display Options section. When a legend is displayed on the map, this configuration can also be accessed from the right-click context menu.
No Map Legend
No legend will be displayed on the main map window.
Display Legend Based on Loaded Vector Types
A legend will be displayed for vector features on the map.
Display Legend Based on Color Palette
A legend will be displayed for palette colors for loaded raster files with palettes.
Display Legend Based on Vector Types and Palette
A legend will be displayed including both vector features and raster palette colors.
Font...
Customize the font used in the distance scale.
Background Color...
Customize the background color of the distance scale.
Position...
Specify where in the map frame the element will be displayed.
Transparency
Use the slider to control the opacity of the element.
Border Style...
Specify the border style for swatches in the legend.
Filter Types...
Specify which feature types to include in the vector legend.
Palette Setup...
Specify which palette colors to use in the palette legend, and setup the palette. For more information on palette setup options see the Layer Options Palette tab.
Label Vector Types By
When styling is controlled by Feature Types, specify the attribute value used to label the legend. If the layer is styled based on Attribute/ Name Values this will be overridden by the list of values. For more information see Vector Data Layer Options.
When Sorting Labels, Treat Digits as Numeric Values
Select this option to use a natural sort order for labels, rather than an strictly alphabetical sort. This will keep numeric values in order of quantity.
Example
The below labels will sort as follows
Alphabetical sort with the option unchecked:
- Iso-height 0
- Iso-height 1
- Iso-height 10
- Iso-height 100
- Iso-height 2
- Iso-height 20
- Iso-Height 200
Numeric or "natural" sort with this option selected:
- Iso-height 0
- Iso-height 1
- Iso-height 2
- Iso-height 10
- Iso-height 20
- Iso-height 100
- Iso-Height 200
Header
Give the legend a title or header label.
Footer
Add footer text to bottom of the legend.
Number of Columns in Legend
By default the legend will display vertically, with one value per row. Specify additional columns to divide the legend horizontally.