Details

	Automatic	automatic layout
	"Row"	left-to-right layout
	"Column"	bottom-to-top layout
	"ReversedRow"	right-to-left layout
	"ReversedColumn"	top-to-bottom layout
	f	layout determined by function f

For LineLegend, PointLegend, and SwatchLegend, the argument to the function f is a table {{style₁,label₁},{style₂,label₂},…} of styles and associated labels.
For BarLegend, the argument to f is a color function cf, range of values {min,max}, and list of contour values contours.

Examples

Format a legend horizontally:

Wolfram Language code: SwatchLegend[63, Range[5], LegendLayout -> "Row"]

Wolfram Language code: BarLegend[{"Rainbow", {0, 1}}, LegendLayout -> "Row"]

Format a legend vertically:

Wolfram Language code: LineLegend[63, Range[5]]

Reverse the order:

Wolfram Language code: LineLegend[63, Range[5], LegendLayout -> "ReversedColumn"]

Wolfram Language code: BarLegend[{"Rainbow", {0, 1}}, LegendLayout -> "ReversedRow"]

Write a function to construct a legend as a formatted table:

Wolfram Language code:

table[pairs_] := TableForm[pairs, TableHeadings -> {{"Group A", "Group B", "Group C"}, {"color", "mascot"}}, TableAlignments -> Center]

Wolfram Language code: SwatchLegend[63, {"lion", "whale", "rocket"}, LegendLayout -> table]

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